iOS触摸事件

{//开始触摸点
    CGPoint _startPoint;

}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        //给testVIew加上颜色
        self.backgroundColor=[UIColor redColor];
        //阻断
         //self.userInteractionEnabled=NO;
        
        
    }
    return self;
    
}

//有什么吩咐开始出发触摸事件的时候,执行touchBegan里面的预定的执行事件代码(开始触摸的时候,到这里来看看.)
//一次触摸事件发生时,该方法只执行一次
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"我要开始摸了.");
    self.backgroundColor=[UIColor greenColor];//点击改变颜色
    self.backgroundColor=[UIColor colorWithRed:kRandomColor green:kRandomColor blue:kRandomColor alpha:1];
    //取出手指触控屏幕的坐标
//    CGPoint sp=[[touches anyObject] locationInView:self];
//    NSLog(@"%@",NSStringFromCGPoint(sp));
    _startPoint=[[touches anyObject] locationInView:self];
    NSLog(@"%@",NSStringFromCGPoint(_startPoint));
    
}


//一次触摸事件尚未结束,会一直调用该方法(没摸完,就一直摸)
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"触摸ing");
    self.backgroundColor=[UIColor colorWithRed:kRandomColor green:kRandomColor blue:kRandomColor alpha:1];//点击移动一直改变颜色
    //取移动中的点
    CGPoint nowPoint=[[touches anyObject] locationInView:self];
    NSLog(@"%@",NSStringFromCGPoint(nowPoint));
    CGFloat x=nowPoint.x-_startPoint.x;
    CGFloat y=nowPoint.y-_startPoint.y;
    CGPoint centerPoint=CGPointMake(self.center.x+x,self.center.y+y);
    self.center=centerPoint;
    
}


//一次触摸事件结束,执行该方法(摸完了)
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"结束了.");
    
}


//触摸事件被别的事件打断(有人打扰)
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{

}