iOS：UIView的transform屬性以及拖拽view的實現，uiviewtransform

iOS：UIView的transform屬性以及拖拽view的實現，uiviewtransform
一,UIView的transform屬性的使用

#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutletUIImageView *imageV;@end@implementation ViewController- (void)viewDidLoad {    [superviewDidLoad];}- (IBAction)moveUp:(id)sender {    //平移    [UIView animateWithDuration:0.5animations:^{        //使用Make,它是相對於最原始的位置做的形變.        //self.imageV.transform = CGAffineTransformMakeTranslation(0, -100);        //相對於上一次做形變.        self.imageV.transform = CGAffineTransformTranslate(self.imageV.transform,0, -100);    }];}- (IBAction)moveDown:(id)sender {    //平移    [UIView animateWithDuration:0.5animations:^{        //使用Make,它是相對於最原始的位置做的形變.        //self.imageV.transform = CGAffineTransformMakeTranslation(0, -100);        //相對於上一次做形變.        self.imageV.transform = CGAffineTransformTranslate(self.imageV.transform,0,100);    }];}- (IBAction)rotation:(id)sender {        [UIViewanimateWithDuration:0.5animations:^{                //旋轉(旋轉的度數, 是一個弧度)        //self.imageV.transform = CGAffineTransformMakeRotation(M_PI_4);                self.imageV.transform = CGAffineTransformRotate(self.imageV.transform,M_PI_4);     }];  }- (IBAction)scale:(id)sender {    [UIView animateWithDuration:0.5animations:^{        //縮放        //self.imageV.transform = CGAffineTransformMakeScale(0.5, 0.5);        self.imageV.transform = CGAffineTransformScale(self.imageV.transform,0.8,0.8);            }];  }@end

二,UIView的touch方法的簡單使用,實現拖拽view的效果

#import "RedView.h"@implementation RedView//當開始觸控螢幕幕的時候調用-(void)touchesBegan:(NSSet *)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 *)touches withEvent:(UIEvent *)event{     //NSLog(@"%s",__func__);    //做UIView拖拽    UITouch *touch = [touches anyObject];        //求位移量 = 手指當前點的X - 手指上一個點的X    CGPoint curP = [touch locationInView:self];    CGPoint preP = [touchpreviousLocationInView:self];    NSLog(@"curP====%@",NSStringFromCGPoint(curP));    NSLog(@"preP====%@",NSStringFromCGPoint(preP));        CGFloat offsetX = curP.x - preP.x;    CGFloat offsetY = curP.y - preP.y;        //平移    self.transform =CGAffineTransformTranslate(self.transform, offsetX, offsetY); }//當手指離開螢幕時調用-(void)touchesEnded:(NSSet *)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 *)touches withEvent:(UIEvent *)event{     NSLog(@"%s",__func__);}@end