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bestswifterbestswifter
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print函数的细节
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‎Streamable/Streamable.xcodeproj/project.pbxproj‎

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// !$*UTF8*$!
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{
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archiveVersion = 1;
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classes = {
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};
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objectVersion = 46;
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objects = {
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/* Begin PBXBuildFile section */
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9B4614361C57472D00619C13 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9B4614351C57472D00619C13 /* main.swift */; };
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9B46143D1C57836B00619C13 /* Print.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9B46143C1C57836B00619C13 /* Print.swift */; };
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9B46143F1C57AFC300619C13 /* Debug.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9B46143E1C57AFC300619C13 /* Debug.swift */; };
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isa = PBXCopyFilesBuildPhase;
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buildActionMask = 2147483647;
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dstPath = /usr/share/man/man1/;
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dstSubfolderSpec = 0;
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files = (
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runOnlyForDeploymentPostprocessing = 1;
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/* End PBXCopyFilesBuildPhase section */
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/* Begin PBXFileReference section */
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9B4614341C57472D00619C13 /* Streamable */,
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9B4614331C57472D00619C13 /* Products */,
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sourceTree = "<group>";
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9B4614321C57472D00619C13 /* Streamable */,
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name = Products;
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isa = PBXGroup;
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children = (
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9B4614351C57472D00619C13 /* main.swift */,
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9B46143C1C57836B00619C13 /* Print.swift */,
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9B46143E1C57AFC300619C13 /* Debug.swift */,
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);
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path = Streamable;
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sourceTree = "<group>";
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9B46142F1C57472D00619C13 /* Frameworks */,
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);
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buildRules = (
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dependencies = (
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name = Streamable;
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productName = Streamable;
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productReference = 9B4614321C57472D00619C13 /* Streamable */;
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productType = "com.apple.product-type.tool";
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};
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/* End PBXNativeTarget section */
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/* Begin PBXProject section */
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9B46142A1C57472D00619C13 /* Project object */ = {
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isa = PBXProject;
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attributes = {
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LastSwiftUpdateCheck = 0720;
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LastUpgradeCheck = 0720;
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ORGANIZATIONNAME = zxy;
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TargetAttributes = {
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CreatedOnToolsVersion = 7.2;
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};
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buildConfigurationList = 9B46142D1C57472D00619C13 /* Build configuration list for PBXProject "Streamable" */;
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compatibilityVersion = "Xcode 3.2";
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en,
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projectDirPath = "";
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targets = (
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9B4614311C57472D00619C13 /* Streamable */,
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9B46143D1C57836B00619C13 /* Print.swift in Sources */,
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isa = XCBuildConfiguration;
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buildSettings = {
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ALWAYS_SEARCH_USER_PATHS = NO;
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CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
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CLANG_CXX_LIBRARY = "libc++";
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CLANG_ENABLE_MODULES = YES;
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CLANG_ENABLE_OBJC_ARC = YES;
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CLANG_WARN_BOOL_CONVERSION = YES;
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CLANG_WARN_CONSTANT_CONVERSION = YES;
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CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
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CLANG_WARN_EMPTY_BODY = YES;
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CLANG_WARN_ENUM_CONVERSION = YES;
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CLANG_WARN_INT_CONVERSION = YES;
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CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
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CLANG_WARN_UNREACHABLE_CODE = YES;
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CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
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CODE_SIGN_IDENTITY = "-";
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COPY_PHASE_STRIP = NO;
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DEBUG_INFORMATION_FORMAT = dwarf;
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ENABLE_STRICT_OBJC_MSGSEND = YES;
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ENABLE_TESTABILITY = YES;
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GCC_C_LANGUAGE_STANDARD = gnu99;
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GCC_DYNAMIC_NO_PIC = NO;
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GCC_NO_COMMON_BLOCKS = YES;
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GCC_OPTIMIZATION_LEVEL = 0;
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GCC_PREPROCESSOR_DEFINITIONS = (
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"DEBUG=1",
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"$(inherited)",
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);
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GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
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GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
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GCC_WARN_UNDECLARED_SELECTOR = YES;
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GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
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GCC_WARN_UNUSED_FUNCTION = YES;
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GCC_WARN_UNUSED_VARIABLE = YES;
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MACOSX_DEPLOYMENT_TARGET = 10.11;
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MTL_ENABLE_DEBUG_INFO = YES;
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ONLY_ACTIVE_ARCH = YES;
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SDKROOT = macosx;
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SWIFT_OPTIMIZATION_LEVEL = "-Onone";
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};
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name = Debug;
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};
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buildSettings = {
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ALWAYS_SEARCH_USER_PATHS = NO;
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CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
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CLANG_CXX_LIBRARY = "libc++";
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CLANG_ENABLE_MODULES = YES;
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CLANG_ENABLE_OBJC_ARC = YES;
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CLANG_WARN_BOOL_CONVERSION = YES;
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CLANG_WARN_CONSTANT_CONVERSION = YES;
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CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
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CLANG_WARN_EMPTY_BODY = YES;
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CLANG_WARN_ENUM_CONVERSION = YES;
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CLANG_WARN_INT_CONVERSION = YES;
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CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
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CLANG_WARN_UNREACHABLE_CODE = YES;
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CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
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CODE_SIGN_IDENTITY = "-";
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COPY_PHASE_STRIP = NO;
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DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
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ENABLE_NS_ASSERTIONS = NO;
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ENABLE_STRICT_OBJC_MSGSEND = YES;
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GCC_C_LANGUAGE_STANDARD = gnu99;
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GCC_NO_COMMON_BLOCKS = YES;
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GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
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GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
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GCC_WARN_UNDECLARED_SELECTOR = YES;
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GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
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GCC_WARN_UNUSED_FUNCTION = YES;
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GCC_WARN_UNUSED_VARIABLE = YES;
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MACOSX_DEPLOYMENT_TARGET = 10.11;
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MTL_ENABLE_DEBUG_INFO = NO;
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SDKROOT = macosx;
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};
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name = Release;
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};
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9B46143A1C57472D00619C13 /* Debug */ = {
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isa = XCBuildConfiguration;
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buildSettings = {
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PRODUCT_NAME = "$(TARGET_NAME)";
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};
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name = Debug;
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};
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9B46143B1C57472D00619C13 /* Release */ = {
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isa = XCBuildConfiguration;
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buildSettings = {
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PRODUCT_NAME = "$(TARGET_NAME)";
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};
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name = Release;
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};
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/* End XCBuildConfiguration section */
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/* Begin XCConfigurationList section */
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9B46142D1C57472D00619C13 /* Build configuration list for PBXProject "Streamable" */ = {
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isa = XCConfigurationList;
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buildConfigurations = (
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9B4614371C57472D00619C13 /* Debug */,
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9B4614381C57472D00619C13 /* Release */,
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);
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defaultConfigurationIsVisible = 0;
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defaultConfigurationName = Release;
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};
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9B4614391C57472D00619C13 /* Build configuration list for PBXNativeTarget "Streamable" */ = {
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isa = XCConfigurationList;
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buildConfigurations = (
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9B46143A1C57472D00619C13 /* Debug */,
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9B46143B1C57472D00619C13 /* Release */,
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);
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defaultConfigurationIsVisible = 0;
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};
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/* End XCConfigurationList section */
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};
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rootObject = 9B46142A1C57472D00619C13 /* Project object */;
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}

‎Streamable/Streamable/Debug.swift‎

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//
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// Debug.swift
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// Streamable
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//
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// Created by 张星宇 on 16/1/26.
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// Copyright © 2016年 zxy. All rights reserved.
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//
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import Foundation
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struct PersonDebug {
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var name: String
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private var age: Int
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init(name: String, age: Int) {
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self.name = name
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self.age = age
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}
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}
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extension PersonDebug: CustomStringConvertible, CustomDebugStringConvertible {
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var description: String {
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return "In CustomStringConvertible Protocol"
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}
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var debugDescription: String {
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return "In CustomDebugStringConvertible Protocol"
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}
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}
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// print优先调用CustomStringConvertible
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func testCustomStringConvertible() {
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print("print结构体")
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let kt = PersonDebug(name: "kt", age: 21)
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print(kt)
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print(String(kt))
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print("")
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}
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// debugPrint优先调用CustomDebugStringConvertible
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func testCustomDebugStringConvertible() {
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print("debugPrint结构体")
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let kt = PersonDebug(name: "kt", age: 21)
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debugPrint(kt)
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print(String(reflecting: kt))
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print("")
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}

‎Streamable/Streamable/Print.swift‎

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//
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// Print.swift
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// Streamable
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//
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// Created by 张星宇 on 16/1/26.
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// Copyright © 2016年 zxy. All rights reserved.
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//
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import Foundation
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struct Person {
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var name: String
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private var age: Int
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init(name: String, age: Int) {
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self.name = name
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self.age = age
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}
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}
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// 1. 调用不带`output`参数的`print`函数，函数内部生成`_Stdout `类型的输出流，调用`_print`函数
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// 2. 在`_print`函数中国处理完`separator`和`terminator `等格式参数后，调用`_print_unlocked `函数处理字符串输出。
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// 3. 在`_print_unlocked `函数的第一个if判断中，因为字符串类型实现了`Streamable `协议，所以调用字符串的`writeTo`函数，写入到输出流中。
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// 4. 根据字符串的`writeTo`函数的定义，它在内部调用了输出流的`write`方法
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// 5. `_Stdout`在其`write`方法中，调用C语言的`putchar`函数输出字符串的每个字符
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func testPrintString() {
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print("Hello, world!")
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}
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// 1. 调用不带`output`参数的`print`函数，函数内部生成`_Stdout `类型的输出流，调用`_print`函数
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// 2. 在`_print`函数中国处理完`separator`和`terminator `等格式参数后，调用`_print_unlocked `函数处理字符串输出。
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// 3. 截止目前和输出字符串一致，不过Int类型(以及其他除了和字符有关的几乎所有类型)没有实现`Streamable `协议，它实现的是`CustomStringConvertible `协议，定义了自己的计算属性`description`
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// 4. `description`是一个字符串类型，调用字符串的`writeTo`方法此前已经讲过，就不再赘述了。
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func testPrintInteger() {
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print(123)
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}
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//1. 调用不带`output`参数的`print`函数，函数内部生成`_Stdout `类型的输出流，调用`_print`函数
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//2. 在`_print`函数中国处理完`separator`和`terminator `等格式参数后，调用`_print_unlocked `函数处理字符串输出。
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//3. 在`_print_unlocked `中调用`_adHocPrint `函数
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//4. switch语句匹配，参数类型是结构体，执行对应case语句中的代码
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func testPrintStruct() {
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print("测试直接打印结构体")
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let kt = Person(name: "kt", age: 21)
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print(kt)
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print("")
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}
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// 字符串的初始化方法中调用`_print_unlocked `函数
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func testCreateString() {
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print("测试通过结构体创建字符串并输出到屏幕")
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let kt = Person(name: "kt", age: 21)
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let string = String(kt)
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print(string)
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print("")
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}

‎Streamable/Streamable/main.swift‎

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//
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// main.swift
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// Streamable
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//
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// Created by 张星宇 on 16/1/26.
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// Copyright © 2016年 zxy. All rights reserved.
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//
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import Foundation
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testPrintStruct()
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testCreateString()
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testCustomStringConvertible()
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testCustomDebugStringConvertible()

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