//移動(dòng)效果 CGAffineTransform CGAffineTransformMakeTranslation ( CGFloat tx, CGFloat ty );CGAffineTransform CGAffineTransformTranslate ( CGAffineTransform t, CGFloat tx, CGFloat ty );//旋轉(zhuǎn)效果 CGAffineTransform CGAffineTransformMakeRotation ( CGFloat angle );CGAffineTransform CGAffineTransformRotate ( CGAffineTransform t, CGFloat angle );//縮放效果 CGAffineTransform CGAffineTransformMakeScale ( CGFloat sx, CGFloat sy );CGAffineTransform CGAffineTransformScale ( CGAffineTransform t, CGFloat sx, CGFloat sy );//反轉(zhuǎn)效果 CGAffineTransform CGAffineTransformInvert ( CGAffineTransform t );//只對(duì)局部產(chǎn)生效果 CGRect CGRectApplyAffineTransform ( CGRect rect, CGAffineTransform t );//判斷兩個(gè)AffineTrans是否相等 bool CGAffineTransformEqualToTransform ( CGAffineTransform t1, CGAffineTransform t2 );//獲得Affine Transform CGAffineTransform CGContextGetUserSpaceToDeviceSpaceTransform ( CGContextRef c );//下面的函數(shù)只起到查看的效果，比如看一下這個(gè)用戶空間的點(diǎn)，轉(zhuǎn)換到設(shè)備空間去坐標(biāo)是多少CGPoint CGContextConvertPointToDeviceSpace ( CGContextRef c, CGPoint point );CGPoint CGContextConvertPointToUserSpace ( CGContextRef c, CGPoint point );CGSize CGContextConvertSizeToDeviceSpace ( CGContextRef c, CGSize size );CGSize CGContextConvertSizeToUserSpace ( CGContextRef c, CGSize size );CGRect CGContextConvertRectToDeviceSpace ( CGContextRef c, CGRect rect );CGRect CGContextConvertRectToUserSpace ( CGContextRef c, CGRect rect );

?

了解動(dòng)畫需要先了解仿射變換,先在View中添加一個(gè)按鈕和一個(gè)圖片, 通過(guò)這演示常見(jiàn)的變換,直接上碼：

#import "ViewController.h"#define M_PI 3.14159265358979323846264338327950288?
#define M_PI_2 1.57079632679489661923132169163975144?
#define M_PI_4 0.785398163397448309615660845819875721 @interface ViewController () {UIButton *btn;UIImageView *imgview; } @end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];btn=[UIButton buttonWithType:UIButtonTypeSystem];btn.frame=CGRectMake(30, 30, 50, 50);btn.backgroundColor=[UIColor redColor];[btn setTitle:@"按鈕" forState:UIControlStateNormal];[btn addTarget:self action:@selector(btnclick:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:btn];imgview=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"test.jpg"]];imgview.frame=CGRectMake(100, 100, 120, 120);[self.view addSubview:imgview];}

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?一.平移變換,當(dāng)我實(shí)驗(yàn)平移時(shí)，將下面代碼放在按鈕點(diǎn)擊方法中,第一個(gè)方法第一次點(diǎn)擊有效，第二個(gè)是每次點(diǎn)擊都會(huì)平移，第三個(gè)不會(huì)平移

//平移變換imgview.transform=CGAffineTransformMakeTranslation(10, 10); //每次移動(dòng)參照點(diǎn)都是初始點(diǎn)imgview.transform=CGAffineTransformTranslate(imgview.transform, 20, 20);//平移參照第一個(gè)參數(shù)的點(diǎn)imgview.transform=CGAffineTransformIdentity;//初始點(diǎn)

?二、旋轉(zhuǎn)

//旋轉(zhuǎn)imgview.transform=CGAffineTransformMakeRotation(M_PI/4);//旋轉(zhuǎn)參照初始值 正數(shù)順時(shí)針 負(fù)數(shù)逆時(shí)針imgview.transform=CGAffineTransformRotate(imgview.transform, -M_PI/4);//旋轉(zhuǎn)參照第一個(gè)參數(shù)的值

?三、縮放

// 縮放imgview.transform=CGAffineTransformScale(imgview.transform,0.8,0.8);//在第一個(gè)參數(shù)的基礎(chǔ)上縮放 第二三參數(shù)1時(shí)為正常大小imgview.transform=CGAffineTransformMakeScale(0.5,0.5);//在原視圖的基礎(chǔ)上縮放

?四、翻轉(zhuǎn)

//翻轉(zhuǎn)// CGAffineTransform DefaultAffineTransform =CGAffineTransformMake(1, 0, 0, 1, 0, 0);//默認(rèn)// imgview.transform=CGAffineTransformInvert(imgview.transform); //調(diào)用此行代碼并不會(huì)產(chǎn)生翻轉(zhuǎn)效果,因?yàn)楹愕染仃?#xff0a;恒等矩陣還是恒等矩陣，這樣就沒(méi)有變化CGAffineTransform AffineTransform =CGAffineTransformMake(0, 1, 1, 1, 1, 0);imgview.transform=CGAffineTransformInvert(AffineTransform);

五、合并

//合并 將兩個(gè)仿射合并成一個(gè)仿射效果 // CGAffineTransform AffineTransform1 =CGAffineTransformMakeScale(0.5,0.5);CGAffineTransform AffineTransform1=CGAffineTransformScale(imgview.transform,0.8,0.8);CGAffineTransform AffineTransform2 =CGAffineTransformMakeRotation(M_PI/4);CGAffineTransform AffineTransform3=CGAffineTransformConcat(AffineTransform1,AffineTransform2);CGAffineTransform AffineTransform4 =CGAffineTransformMake(0, 1, 1, 1, 1, 0);imgview.transform=CGAffineTransformConcat(AffineTransform3,AffineTransform4);

?六、判斷是否相同

CGAffineTransform DefaultAffineTransform =CGAffineTransformMake(1, 0, 0, 1, 0, 0);CGAffineTransform DefaultAffineTransform1 =CGAffineTransformMake(1, 0, 0, 1, 0, 0); // CGAffineTransform AffineTransform1 =CGAffineTransformMakeScale(0.5,0.5);bool flag=CGAffineTransformEqualToTransform(DefaultAffineTransform, DefaultAffineTransform1);NSLog(@"%d",flag);

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轉(zhuǎn)載于:https://www.cnblogs.com/5ishare/p/4384177.html

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