首页 > 代码库 > UIImage 旋转和保存旋转 (转载)

UIImage 旋转和保存旋转 (转载)

2024-07-12 03:34:02   229人阅读

最近一直没有写笔记, 总感觉自己少了点什么, 也没有转载什么有用的笔记, 今天小弟特此献上一篇图片旋转和保存旋转的功能实现, 注意这是转载, 我是来当自己笔记的, 哈哈哈哈...

 1 @interface ViewController () 2 { 3     UIImageView * iv; 4 } 5 @end 6  7 @implementation ViewController 8  9 - (void)viewDidLoad10 {11     [super viewDidLoad];12     // Do any additional setup after loading the view, typically from a nib.13     14     CGRect rect = [[UIScreen mainScreen] bounds];15     16     // 图像17     iv = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"haha.png"]];18     iv.frame = CGRectMake(60, 100, 200, 200);19     [self.view addSubview:iv];20     21     // 旋转按扭22     UIButton * rotateBtn = [UIButton buttonWithType:UIButtonTypeCustom];23     rotateBtn.frame = CGRectMake(0, rect.size.height-44, rect.size.width, 44);24     rotateBtn.backgroundColor = [UIColor greenColor];25     [rotateBtn addTarget:self action:@selector(rotateBtnClick) forControlEvents:UIControlEventTouchUpInside];26     [self.view addSubview:rotateBtn];27 }28 29 #pragma mark - 调用图片旋转方法并保存旋转30 - (void)rotateBtnClick31 {32     iv.image = [self image:iv.image rotation:UIImageOrientationRight];33     34     NSString * path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];35     NSString * filePath = [NSString stringWithFormat:@"%@/rotateImage.png", path];36     NSData * data =http://www.mamicode.com/ UIImagePNGRepresentation(iv.image);37     [data writeToFile:filePath atomically:YES];38 }39 40 #pragma mark - 图片旋转方法41 - (UIImage *)image:(UIImage *)image rotation:(UIImageOrientation)orientation42 {43     long double rotate = 0.0;44     CGRect rect;45     float translateX = 0;46     float translateY = 0;47     float scaleX = 1.0;48     float scaleY = 1.0;49     50     switch (orientation) {51         case UIImageOrientationLeft:52             rotate = M_PI_2;53             rect = CGRectMake(0, 0, image.size.height, image.size.width);54             translateX = 0;55             translateY = -rect.size.width;56             scaleY = rect.size.width/rect.size.height;57             scaleX = rect.size.height/rect.size.width;58             break;59         case UIImageOrientationRight:60             rotate = 3 * M_PI_2;61             rect = CGRectMake(0, 0, image.size.height, image.size.width);62             translateX = -rect.size.height;63             translateY = 0;64             scaleY = rect.size.width/rect.size.height;65             scaleX = rect.size.height/rect.size.width;66             break;67         case UIImageOrientationDown:68             rotate = M_PI;69             rect = CGRectMake(0, 0, image.size.width, image.size.height);70             translateX = -rect.size.width;71             translateY = -rect.size.height;72             break;73         default:74             rotate = 0.0;75             rect = CGRectMake(0, 0, image.size.width, image.size.height);76             translateX = 0;77             translateY = 0;78             break;79     }80     81     UIGraphicsBeginImageContext(rect.size);82     CGContextRef context = UIGraphicsGetCurrentContext();83     84     //做CTM变换85     CGContextTranslateCTM(context, 0.0, rect.size.height);86     CGContextScaleCTM(context, 1.0, -1.0);87     CGContextRotateCTM(context, rotate);88     CGContextTranslateCTM(context, translateX, translateY);89     CGContextScaleCTM(context, scaleX, scaleY);90     91     //绘制图片92     CGContextDrawImage(context, CGRectMake(0, 0, rect.size.width, rect.size.height), image.CGImage);93     94     UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();95     96     return newPic;97 }

 


联系
我们