图像旋转

#import "ViewController.h"

 

@interface ViewController ()

@property (strong, nonatomic) IBOutlet UIImageView *imageview;

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

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

 

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

 

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

 

//CGAffineTransform transform = self.imageview.transform;

if (sender.tag == 0)

{

//平移

//单次向上平移

//self.imageview.transform = CGAffineTransformMakeTranslation(0, -50);

//多次平移

self.imageview.transform = CGAffineTransformTranslate(self.imageview.transform, 0, -50);

}

if (sender.tag == 1)

{

//旋转

//单次旋转

//self.imageview.transform = CGAffineTransformMakeRotation(M_PI_4);//顺时针选装90°

//多次旋转

self.imageview.transform = CGAffineTransformRotate(self.imageview.transform, M_PI_4);

}

if (sender.tag == 2)

{

//缩放

//单次缩放

//self.imageview.transform = CGAffineTransformMakeScale(1.5, 1.5);

//多次缩放

self.imageview.transform = CGAffineTransformScale(self.imageview.transform, 1.5, 1.5);

}

}

@end