//
// OrangeView.m
// 拖拽View跟隨手指浮動(dòng)
//
// Created by llkj on 2017/8/16.
// Copyright © 2017年 LayneCheung. All rights reserved.
//

#import "OrangeView.h"

@implementation OrangeView

//當(dāng)開始觸摸屏幕的時(shí)候調(diào)用
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

 NSLog(@"%s", __func__);
}

//觸摸時(shí)開始移動(dòng)時(shí)調(diào)用(移動(dòng)時(shí)會持續(xù)調(diào)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(dāng)前點(diǎn)的X - 手指上一個(gè)點(diǎn)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(dāng)手指離開屏幕時(shí)調(diào)用
-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

 NSLog(@"%s", __func__);
}

//當(dāng)發(fā)生系統(tǒng)事件時(shí)就會調(diào)用該方法(電話打入,自動(dòng)關(guān)機(jī))
- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

 NSLog(@"%s", __func__);
}
@end