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  • 小功能--视图跟着触点移动

    手指点击视图,移动手指,视图跟着手指进行移动

    实现方法,可以进行自定义视图,在视图中添加方法;

    #import "DargView.h"
    @interface DargView ()
    {
        CGPoint point1;
    }
    @end
    @implementation DargView
    
    - (id)initWithFrame:(CGRect)frame
    {
        self = [super initWithFrame:frame];
        if (self) {
            // Initialization code
        }
        return self;
    }
    
    - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
    {
        NSLog(@"开始");
        self.backgroundColor = [UIColor yellowColor];
        //1.
        //获取手指位置(自身的坐标系)
        UITouch *touch = [touches anyObject];
        //locationInView:手指触摸哪个视图上的坐标 后面写self说明他依据的是他所在的坐标系
        CGPoint point = [touch locationInView:self.superview];//将坐标系转换成父试图的坐标系
        point1.x = point.x - self.center.x;
        point1.y = point.y - self.center.y;
    }
    
    
    - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
    {
        //手指移动 视图跟着移动
        NSLog(@"移动");
        UITouch *touch = [touches anyObject];
        CGPoint point = [touch locationInView:self.superview];//将坐标系转换成父试图的坐标系
        CGPoint pointEmpty = CGPointMake(point.x - point1.x,point.y - point1.y);
        self.center = pointEmpty;
    }
    
    - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
    {
        NSLog(@"结束");
         self.backgroundColor = [UIColor redColor];
    }
    
    - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
    {
        NSLog(@"....");
    }

    这只是一个简单的小玩意儿~~~~

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  • 原文地址:https://www.cnblogs.com/nsjelly/p/6364556.html
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