更新demo

bestswifter · bestswifter · commit 3a9d03f0f806 · 2016-02-01T23:33:07.000+08:00
diff --git a/load/load.xcodeproj/project.pbxproj b/load/load.xcodeproj/project.pbxproj
@@ -11,6 +11,7 @@
 		9B8E43D31C5F6E78002ABEBC /* Parent.m in Sources */ = {isa = PBXBuildFile; fileRef = 9B8E43D21C5F6E78002ABEBC /* Parent.m */; };
 		9B8E43D61C5F6E7E002ABEBC /* Child.m in Sources */ = {isa = PBXBuildFile; fileRef = 9B8E43D51C5F6E7E002ABEBC /* Child.m */; };
 		9B8E43DC1C5F94E2002ABEBC /* Other.m in Sources */ = {isa = PBXBuildFile; fileRef = 9B8E43DA1C5F94E2002ABEBC /* Other.m */; };
+		9B8E43DF1C5FA5D5002ABEBC /* Child+load.m in Sources */ = {isa = PBXBuildFile; fileRef = 9B8E43DE1C5FA5D5002ABEBC /* Child+load.m */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -34,6 +35,8 @@
 		9B8E43D51C5F6E7E002ABEBC /* Child.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = Child.m; sourceTree = "<group>"; };
 		9B8E43DA1C5F94E2002ABEBC /* Other.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = Other.m; sourceTree = "<group>"; };
 		9B8E43DB1C5F94E2002ABEBC /* Other.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Other.h; sourceTree = "<group>"; };
+		9B8E43DD1C5FA5D5002ABEBC /* Child+load.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "Child+load.h"; sourceTree = "<group>"; };
+		9B8E43DE1C5FA5D5002ABEBC /* Child+load.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "Child+load.m"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -66,9 +69,11 @@
 		9B8E43C91C5F6E40002ABEBC /* load */ = {
 			isa = PBXGroup;
 			children = (
-				9B8E43DA1C5F94E2002ABEBC /* Other.m */,
-				9B8E43DB1C5F94E2002ABEBC /* Other.h */,
 				9B8E43CA1C5F6E40002ABEBC /* main.m */,
+				9B8E43DD1C5FA5D5002ABEBC /* Child+load.h */,
+				9B8E43DE1C5FA5D5002ABEBC /* Child+load.m */,
+				9B8E43DB1C5F94E2002ABEBC /* Other.h */,
+				9B8E43DA1C5F94E2002ABEBC /* Other.m */,
 				9B8E43D11C5F6E78002ABEBC /* Parent.h */,
 				9B8E43D21C5F6E78002ABEBC /* Parent.m */,
 				9B8E43D41C5F6E7E002ABEBC /* Child.h */,
@@ -136,6 +141,7 @@
 				9B8E43CB1C5F6E40002ABEBC /* main.m in Sources */,
 				9B8E43D61C5F6E7E002ABEBC /* Child.m in Sources */,
 				9B8E43D31C5F6E78002ABEBC /* Parent.m in Sources */,
+				9B8E43DF1C5FA5D5002ABEBC /* Child+load.m in Sources */,
 				9B8E43DC1C5F94E2002ABEBC /* Other.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/load/load/Child+load.h b/load/load/Child+load.h
@@ -0,0 +1,13 @@
+//
+//  Child+load.h
+//  load
+//
+//  Created by 张星宇 on 16/2/1.
+//  Copyright © 2016年 zxy. All rights reserved.
+//
+
+#import "Child.h"
+
+@interface Child (load)
+
+@end
diff --git a/load/load/Child+load.m b/load/load/Child+load.m
@@ -0,0 +1,28 @@
+//
+//  Child+load.m
+//  load
+//
+//  Created by 张星宇 on 16/2/1.
+//  Copyright © 2016年 zxy. All rights reserved.
+//
+
+#import "Child+load.h"
+
+@implementation Child (load)
+
++ (void)load {
+    /**
+     *  分类中的load方法会被调用
+     */
+    NSLog(@"Load Class Child+load");
+}
+
+/**
+ *  initialize更像是一个普通的方法。
+ *  即使在Child.m中实现了initialize方法，也会在这里被覆盖
+ */
+//+ (void)initialize {
+//    NSLog(@"Initialize Class Child+load");
+//}
+
+@end
diff --git a/load/load/Child.m b/load/load/Child.m
@@ -14,10 +14,13 @@ @implementation Child
 + (void)load {
     NSLog(@"Load Class Child");
     
-    Other *normal = [[Other alloc] init];
-    NSLog(@"%@",normal);
+    /**
+     *  这时候Other类还没调用load方法，所以输出结果是Original Output
+     */
+    Other *other = [Other new];
+    [other originalFunc];
     
-    // 如果不先调用Normal的load，下面这行代码就无效，打印出null
+    // 如果不先调用other的load，下面这行代码就无效，打印出null
     [Other printName];
 }
 
diff --git a/load/load/Other.h b/load/load/Other.h
@@ -11,5 +11,6 @@
 @interface Other : NSObject
 
 + (void)printName;
+- (void)originalFunc;
 
 @end
diff --git a/load/load/Other.m b/load/load/Other.m
@@ -7,18 +7,32 @@
 //
 
 #import "Other.h"
+#import <objc/runtime.h>
 
 @implementation Other
 
 static NSString *name;
 
 + (void)load {
     name = @"Other";
-    NSLog(@"Load Class Normal");
+    NSLog(@"Load Class Other");
+    
+    Method originalFunc = class_getInstanceMethod([self class], @selector(originalFunc));
+    Method swizzledFunc = class_getInstanceMethod([self class], @selector(swizzledFunc));
+    
+    method_exchangeImplementations(originalFunc, swizzledFunc);
 }
 
 + (void)printName {
     NSLog(@"%@",name);
 }
 
+- (void)originalFunc {
+    NSLog(@"Original Output");
+}
+
+- (void)swizzledFunc {
+    NSLog(@"Swizzled Output");
+}
+
 @end
diff --git a/load/load/Parent.m b/load/load/Parent.m
@@ -17,9 +17,9 @@ + (void)load {
     NSLog(@"Load Class Parent");
 }
 
-//+ (void)initialize {
-//    NSLog(@"Initialize Parent, caller Class %@", [self class]);
-//}
++ (void)initialize {
+    NSLog(@"Initialize Parent, caller Class %@", [self class]);
+}
 
 /**
  *  下面这个才是正确的initialize方法的实现，需要判断是不是由自己这个类调用的。
diff --git a/load/load/main.m b/load/load/main.m
@@ -8,13 +8,21 @@
 
 #import <Foundation/Foundation.h>
 #import "Child.h"
+#import "Other.h"
 
 int main(int argc, const char * argv[]) {
     @autoreleasepool {
-        // insert code here...
-        NSLog(@"Hello, World!");
-        
+        NSLog(@"Main函数在这里开始");
+        /**
+         *  这会触发Child和父类的initialize方法
+         */
         Child *child = [Child new];
+        
+        /**
+         *  这时候other已经调用过load方法，所以输出结果是Swizzled Output
+         */
+        Other *other = [Other new];
+        [other originalFunc];
     }
     return 0;
 }
