//// OrangeView.m// 拖拽View跟隨手指浮動//// Created by llkj on 2017/8/16.// Copyright © 2017年 LayneCheung. All rights reserved.//#import "OrangeView.h"@implementation OrangeView//當開始觸摸屏幕的時候調用- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ NSLog(@"%s", __func__);}//觸摸時開始移動時調用(移動時會持續調用)//NSSet:無序//NSArray:有序- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ NSLog(@"%s", __func__); UITouch *touch = [touches anyObject]; //求偏移量 = 手指當前點的X - 手指上一個點的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);}//當手指離開屏幕時調用-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ NSLog(@"%s", __func__);}//當發生系統事件時就會調用該方法(電話打入,自動關機)- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ NSLog(@"%s", __func__);}@end