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。