http://blog.csdn.net/mamong/article/details/20831899

代码资源

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIButton *btn;

@end

@implementation ViewController

@synthesize btn;

- (void)viewDidLoad

{

[super viewDidLoad];

self.btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

self.btn.frame = CGRectMake(10, 10, 50, 50);

[self.btn setTitle:@"触摸" forState:UIControlStateNormal];

[self.btn setTitle:@"移动" forState:UIControlEventTouchDown];

[self.btn addTarget:self action:@selector(dragMoving:withEvent: )forControlEvents: UIControlEventTouchDragInside];

[self.btn addTarget:self action:@selector(dragEnded:withEvent: )forControlEvents: UIControlEventTouchUpInside |

UIControlEventTouchUpOutside];

[self.view addSubview:self.btn];

}

- (void) dragMoving: (UIControl *) c withEvent:ev

{

c.center = [[[ev allTouches] anyObject] locationInView:self.view];

}

- (void) dragEnded: (UIControl *) c withEvent:ev

{

c.center = [[[ev allTouches] anyObject] locationInView:self.view];

}

@end