//移動效果 CGAffineTransform CGAffineTransformMakeTranslation ( CGFloat tx, CGFloat ty );CGAffineTransform CGAffineTransformTranslate ( CGAffineTransform t, CGFloat tx, CGFloat ty );//旋轉效果 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 );//反轉效果 CGAffineTransform CGAffineTransformInvert ( CGAffineTransform t );//只對局部產生效果 CGRect CGRectApplyAffineTransform ( CGRect rect, CGAffineTransform t );//判斷兩個AffineTrans是否相等 bool CGAffineTransformEqualToTransform ( CGAffineTransform t1, CGAffineTransform t2 );//獲得Affine Transform CGAffineTransform CGContextGetUserSpaceToDeviceSpaceTransform ( CGContextRef c );//下面的函數只起到查看的效果，比如看一下這個用戶空間的點，轉換到設備空間去坐標是多少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 );

?

了解動畫需要先了解仿射變換,先在View中添加一個按鈕和一個圖片, 通過這演示常見的變換,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];}

?

?一.平移變換,當我實驗平移時，將下面代碼放在按鈕點擊方法中,第一個方法第一次點擊有效，第二個是每次點擊都會平移，第三個不會平移

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

?二、旋轉

//旋轉imgview.transform=CGAffineTransformMakeRotation(M_PI/4);//旋轉參照初始值 正數順時針 負數逆時針imgview.transform=CGAffineTransformRotate(imgview.transform, -M_PI/4);//旋轉參照第一個參數的值

?三、縮放

// 縮放imgview.transform=CGAffineTransformScale(imgview.transform,0.8,0.8);//在第一個參數的基礎上縮放 第二三參數1時為正常大小imgview.transform=CGAffineTransformMakeScale(0.5,0.5);//在原視圖的基礎上縮放

?四、翻轉

//翻轉// CGAffineTransform DefaultAffineTransform =CGAffineTransformMake(1, 0, 0, 1, 0, 0);//默認// imgview.transform=CGAffineTransformInvert(imgview.transform); //調用此行代碼并不會產生翻轉效果,因為恒等矩陣＊恒等矩陣還是恒等矩陣，這樣就沒有變化CGAffineTransform AffineTransform =CGAffineTransformMake(0, 1, 1, 1, 1, 0);imgview.transform=CGAffineTransformInvert(AffineTransform);

五、合并

//合并 將兩個仿射合并成一個仿射效果 // 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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轉載于:https://www.cnblogs.com/5ishare/p/4384177.html

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