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iOS实现拖拽View跟随手指浮动效果

    本文实例为大家分享了iOS实现拖拽View跟随手指浮动的具体代码,供大家参考,具体内容如下

    效果图:

    1.自定义要跟随手指浮动的那个View

    
    //
    // OrangeView.m
    // 拖拽View跟随手指浮动
    //
    // Created by llkj on 2017/8/16.
    // Copyright © 2017年 LayneCheung. All rights reserved.
    //
    
    #import "OrangeView.h"
    
    @implementation OrangeView
    
    //当开始触摸屏幕的时候调用
    - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    
     NSLog(@"%s", __func__);
    }
    
    //触摸时开始移动时调用(移动时会持续调用)
    //NSSet:无序
    //NSArray:有序
    - (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    
     NSLog(@"%s", __func__);
    
     UITouch *touch = [touches anyObject];
    
     //求偏移量 = 手指当前点的X - 手指上一个点的X
     CGPoint currentPoint = [touch locationInView:self];
     CGPoint prePoint = [touch previousLocationInView:self];
    
     NSLog(@"ccurrentPoint = %@", NSStringFromCGPoint(currentPoint));
     NSLog(@"prePiont = %@", NSStringFromCGPoint(prePoint));
    
     CGFloat offSetX = currentPoint.x - prePoint.x;
     CGFloat offSetY = currentPoint.y - prePoint.y;
    
     //平移
     self.transform = CGAffineTransformTranslate(self.transform, offSetX, offSetY);
    }
    
    //当手指离开屏幕时调用
    -(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    
     NSLog(@"%s", __func__);
    }
    
    //当发生系统事件时就会调用该方法(电话打入,自动关机)
    - (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    
     NSLog(@"%s", __func__);
    }
    @end

    2.创建自定义的View

    在storyboard中拖一个View绑定他的类为OrangeView;
    或者代码创建手动添加到控制器的View上去;

    以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持lingkb。