2023年7月13日发(作者：)

仿射变换---位移+缩放⽐例+旋转对于仿射变换的理解，以本⼈现阶段⽔平还谈不上是深⼊了解，我喜欢把它想象成⼀种简单的动画效果，下⾯介绍⼏种简单的变化：位置移动，按⼀定⽐例缩放，顺时针、逆时针旋转#import "ViewController.h"@interface ViewController ()@property (nonatomic,weak) UIView * rectView;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad];

//"点我" 控制按钮 UIButton * button=[UIButton buttonWithType:UIButtonTypeCustom]; [button setTitle:@"点我" forState:UIControlStateNormal]; =CGRectMake(-110, 20, 100, 44); oundColor=[UIColor redColor]; //添加点击事件 [button addTarget:self action:@selector(clickMeAction) forControlEvents:UIControlEventTouchUpInside]; [ addSubview:button];

UIView * rectView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 150, 150)]; =; oundColor=[UIColor greenColor]; ew=rectView; [ addSubview:rectView];}#pragma mark - clickAction- (void) clickMeAction{//仿射变换移动 //1.从当前位置，向右移动50，向下移动100 (直接变换) /* orm=CGAffineTransformMakeTranslation(50, 100); */

//2.(⽅法⼀)从当前位置，向右移动50，向下移动100 （0.5秒钟时延） /* [UIView animateWithDuration:0.5 animations:^{ orm=CGAffineTransformMakeTranslation(50, 100); }]; */

//3.(⽅法⼆)从当前位置，向右移动50，向下移动100 （0.5秒钟时延） /* [UIView animateWithDuration:0.5 animations:^{ //orm=CGAffineTransformMakeTranslation(50, 100); orm=CGAffineTransformTranslate(orm, 100, 100); }]; */

//仿射变换⽐例 //1.中⼼点不变，宽度缩⼩为原来的0.1倍，⾼度缩短为原来的0.5倍 /* [UIView animateWithDuration:0.5 animations:^{ orm=CGAffineTransformMakeScale(0.1, 0.5); }]; */

//2.中⼼点不变，扩⼤为原来的5倍 /* [UIView animateWithDuration:0.5 animations:^{ orm=CGAffineTransformMakeScale(5, 5); }]; */

//3.(⽅法⼀)向右向下各移动100 /* [UIView animateWithDuration:0.5 animations:^{ orm=CGAffineTransformMakeTranslation(100, 100); }]; */

//4.(⽅法⼆)向右向下各移动100 /* [UIView animateWithDuration:0.5 animations:^{ orm=CGAffineTransformMakeTranslation(100, 100); }]; */

//5.在前⼀个位置的基础之上，向右向下分别移动1个距离 /* [UIView animateWithDuration:0.5 animations:^{ orm=CGAffineTransformTranslate(orm,1,1); }]; */

//6.在前⼀个位置的基础之上，向右向下分别移动100个距离 /* [UIView animateWithDuration:0.5 animations:^{ CGAffineTransform form=orm; orm=CGAffineTransformTranslate(form,100,100); }]; */

//7.来回弹跳切换着向右下⾓移动10个单位 /* [UIView animateWithDuration:0.5 animations:^{ CGAffineTransform form=orm; orm=CGAffineTransformMakeScale(2, 2); orm=CGAffineTransformTranslate(form,10,10); }]; */

//仿射变换---旋转 //1.顺时针旋转90度 /* [UIView animateWithDuration:0.5 animations:^{ orm=CGAffineTransformMakeRotation(M_PI_2); }]; */

//2.在前⼀个位置的基础之上,顺时针旋转45度 /* [UIView animateWithDuration:0.5 animations:^{ CGAffineTransform form=orm; orm=CGAffineTransformRotate(form,M_PI_4); }]; */

//3.在前⼀个位置的基础之上,逆时针旋转45度 /* [UIView animateWithDuration:0.5 animations:^{ CGAffineTransform form=orm;

orm=CGAffineTransformRotate(form,-M_PI_4); }]; */

//4.在前⼀个位置的基础之上,顺时针旋转确定的度数 [UIView animateWithDuration:0.5 animations:^{ CGAffineTransform form=orm;

orm=CGAffineTransformRotate(form,9/100.0*M_PI); }];

}@end