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 /8/16.
// Copyright © LayneCheung. All rights reserved.
//
#import "OrangeView.h"
@implementation OrangeView
//当开始触摸屏幕的时候调用
- (void)touchesBegan:(NSSet *)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 *)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 *)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 *)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；
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