UITouch
#pragma mark == 手指移动触发的方法
- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
//1.获取触摸对象touch
UITouch *touch = [touches anyObject];
//2.通过触摸对象来获取触摸的点参照谁的坐标系:self.view
lastPoint= [touch locationInView:self.view];
}
#pragma mark =====手指按下移动触发的方法
- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
//1.touch
UITouch *touch = [touches anyObject];
//point
CGPoint currentPoint = [touch locationInView:self.view];
//移动的距离
floatx = currentPoint.x-lastPoint.x;
floaty = currentPoint.y-lastPoint.y;
//改变view的位置
//view.frame = CGRectMake(view.frame.origin.x + x, view.frame.origin.y, CGRectGetWidth(view.frame), CGRectGetHeight(view.frame));
//如果上一个点不在对象区域范围内就不让对象移动
//点在图上
if(CGRectContainsPoint(_Myview.frame,lastPoint)) {
//偏移
_Myview.center=CGPointMake(_Myview.center.x+x,_Myview.center.y+y);
//赋值给上一个点，更新点坐标
lastPoint= currentPoint;
}
}
