iOS-封装可以随意拖动的UI控件(以UITextField为例)

一:前言

可以随意拖动的UITextField

二:简要步骤

<0> 新建CustomFlowTextField继承于UITextField
<1>在.m文件写下touchesMoved的方法

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    
    [super touchesMoved:touches withEvent:event];
    
    UITouch * touch = [touches anyObject];
    //本次触摸点
    CGPoint current = [touch locationInView:self];
    //上次触摸点
    CGPoint previous = [touch previousLocationInView:self];
    //未移动的中心点
    CGPoint center = self.center;
    //移动之后的中心点(未移动的点+本次触摸点-上次触摸点)
    center.x += current.x - previous.x;
    center.y += current.y - previous.y;
    //更新位置
    self.center = center;
}

<2>欢迎各位大牛补充指正