1 #import "UITestAppAppDelegate.h" 2  3 @implementation UITestAppAppDelegate 4  5 @synthesize window; 6 @synthesize img; 7  8 - (void) applicationDidFinishLaunching:(UIApplication *)application{ 9     CGRect frame = CGRectMake(80, 100, 80, 120);10     img = [[UIImageView alloc] initWithFrame:frame];11     [img setImage:[UIImage imageNamed:@"4.png"]];12     [window addSubview:img];13     [window makeKeyAndVisible];    14 }15 -(IBAction) increaseSizeButtonPressed{16     CGRect newframe = CGRectMake(20, 50, 240, 360);17     img = [[UIImageView alloc] initWithFrame:newframe];18     [img setImage:[UIImage imageNamed:@"4.png"]];19     img.frame = newframe;20     [window addSubview:img];21 }22 -(IBAction) decreaseSizeButtonPressed{23     CGRect newframe = CGRectMake(0, 0, 32, 48);24      img = [[UIImageView alloc] initWithFrame:newframe];25     [img setImage:[UIImage imageNamed:@"4.png"]];26     [window addSubview:img];27     img.frame = newframe;28 }29 - (void)dealloc {30     [img release];31     [window release];32     [super dealloc];33 }34 35 36 @end