实现的效果图：
自定义MVButton，继承自UIButton.
属性声明如下：
@property (nonatomic) CGPoint beginPoint;
@property (nonatomic) BOOL dragEnable;
//自定义button对触摸事件进行响应
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{//dragEnable = NO 则不响应动作if (!_dragEnable) {return;}UITouch *touch = [touches anyObject];//获取button的当前位置_beginPoint = [touch locationInView:self];
}
//拖动自定义button时响应
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{if (!_dragEnable) {return;}UITouch *touch = [touches anyObject];//获取要移动到的目标位置CGPoint nowPoint = [touch locationInView:self];
//确定目标位置与开始位置的偏移量float offsetX = nowPoint.x - _beginPoint.x;float offsetY = nowPoint.y - _beginPoint.x;//按照button的center属性移动buttonself.center = CGPointMake(self.center.x + offsetX, self.center.y + offsetY);
}
在ViewController.m中实现的代码如下：
首先导入自定义的button：
#import "MVButton.h"
具体实现：
- (void)viewDidLoad
{[super viewDidLoad];MVButton *mvButton = [[MVButton alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];mvButton.backgroundColor = [UIColor yellowColor];mvButton.dragEnable = YES;[self.view addSubview:mvButton];
}
