iOS -- 通过transform对图片进行移动和缩放

#import "ViewController.h"

@interface ViewController ()

- (IBAction)move:(UIButton *)sender;

- (IBAction)zoom:(UIButton *)sender;

- (IBAction)rotate:(UIButton *)sender;

@end

@implementation ViewController

// 移动

- (IBAction)move:(UIButton *)sender {

UIButton *img = (UIButton *)[self.view viewWithTag:10];

switch (sender.tag){

case 1: // 上

img.transform = CGAffineTransformTranslate(img.transform, 0, -10);

break;

case 2: // 下

img.transform = CGAffineTransformTranslate(img.transform, 0, 10);

break;

case 3: // 左

img.transform = CGAffineTransformTranslate(img.transform, -10, 0);

break;

case 4: // 右

img.transform = CGAffineTransformTranslate(img.transform, 10, 0);

break;

}

}

// 缩放

- (IBAction)zoom:(UIButton *)sender {

UIButton *img = (UIButton *)[self.view viewWithTag:10];

switch (sender.tag){

case 5: // 放大

img.transform = CGAffineTransformScale(img.transform, 1.2, 1.2);

break;

case 6: // 缩小

img.transform = CGAffineTransformScale(img.transform, 0.8, 0.8);

break;

}

}

#pragma mark 旋转

- (IBAction)rotate:(UIButton *)sender {

UIButton *img = (UIButton *)[self.view viewWithTag:10];

switch (sender.tag){

case 7: // 左旋转

img.transform = CGAffineTransformRotate(img.transform, -0.25);

break;

case 8: // 右旋转

img.transform = CGAffineTransformRotate(img.transform, 0.25);

break;

}

}

@end