First off, make a global variable LogView *logView;

To initialize the newly created logView use the -(void)initWithFrame:(CGRect) maxLines:(unsigned int) method. Here is an example:

CGRect screen = [[UIScreen mainScreen] bounds];
logView = [[LogView alloc] initWithFrame:screen maxLines:12];
[[[UIApplication sharedApplication] keyWindow] addSubview:logView];
[[[UIApplication sharedApplication] keyWindow] bringSubviewToFront:logView];

To log use the -(void)log:(NSString*) method. To log variables or other fun stuff use the stringWithFormat: method from NSString. Here is an example:

unsigned int myValue = 12;
[logView log:[NSString stringWithFormat:@"myValue is stored at %p with value %d", &myValue, myValue]];

• Makes target app slow. (Reduces FPS probably due to memory being constantly updated)