一个实现图片放大缩小的笨办法

 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