iphone开发--UIImage 图片处理：截图，缩放，设定大小，存储

feiyang10086

iphone开发--UIImage 图片处理：截图，缩放，设定大小，存储

转自:http://my.oschina.net/rareliu/blog/24322



1、等比缩放



C代码  
- (

1. UIImage *) scaleImage:(UIImage *)image toScale:(float)scaleSize {   
   
2.     UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize);   
   
3.     [image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];   
   
4.     UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();   
   
5.     UIGraphicsEndImageContext();   
   
6.     return scaledImage;   
   
7. }  
   
8. 
   
9. - (UIImage *) scaleImage:(UIImage *)image toScale:(float)scaleSize {
   
10.     UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize);
    
11.     [image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];
    
12.     UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    
13.     UIGraphicsEndImageContext();
    
14.     return scaledImage;
    
15. }

复制代码

2、自定义大小



C代码  
- (

1. UIImage *) reSizeImage:(UIImage *)image toSize:(CGSize)reSize {   
   
2.     UIGraphicsBeginImageContext(CGSizeMake(reSize.width, reSize.height));   
   
3.     [image drawInRect:CGRectMake(0, 0, reSize.width, reSize.height)];   
   
4.     UIImage *reSizeImage = UIGraphicsGetImageFromCurrentImageContext();   
   
5.     UIGraphicsEndImageContext();   
   
6.     return reSizeImage;   
   
7. }  
   
8. 
   
9. - (UIImage *) reSizeImage:(UIImage *)image toSize:(CGSize)reSize {
   
10.     UIGraphicsBeginImageContext(CGSizeMake(reSize.width, reSize.height));
    
11.     [image drawInRect:CGRectMake(0, 0, reSize.width, reSize.height)];
    
12.     UIImage *reSizeImage = UIGraphicsGetImageFromCurrentImageContext();
    
13.     UIGraphicsEndImageContext();
    
14.     return reSizeImage;
    
15. }

复制代码

3、处理某个特定的view

     只要是继承UIView的object 都可以处理
     必须先import QuzrtzCore.framework



C代码

1. -(UIImage*) captureView:(UIView *)theView {   
   
2.     CGRect rect = theView.frame;   
   
3.     UIGraphicsBeginImageContext(rect.size);   
   
4.     CGContextRef context = UIGraphicsGetCurrentContext();   
   
5.     [theView.layer renderInContext:context];   
   
6.     UIImage *img = UIGraphicsGetImageFromCurrentImageContext();   
   
7.     UIGraphicsEndImageContext();   
   
8.     return img;   
   
9. }  
   
10. 
    
11. -(UIImage*) captureView:(UIView *)theView {
    
12.     CGRect rect = theView.frame;
    
13.     UIGraphicsBeginImageContext(rect.size);
    
14.     CGContextRef context = UIGraphicsGetCurrentContext();
    
15.     [theView.layer renderInContext:context];
    
16.     UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    
17.     UIGraphicsEndImageContext();
    
18.     return img;

复制代码

}

4、存储图片

    4.1、存储到app的文件里

    把要处理的图片以image.png的名字存储到app home地下的Document目录中



C代码

1. NSString *path = [[NSHomeDirectory()stringByAppendingPathComponent:@"Documents"]stringByAppendingPathComponent:@"image.png"];   
   
2. [UIImagePNGRepresentation(image) writeToFile:pathatomically:YES];  
   
3. 
   
4. NSString *path = [[NSHomeDirectory()stringByAppendingPathComponent:@"Documents"]stringByAppendingPathComponent:@"image.png"];
   
5. [UIImagePNGRepresentation(image) writeToFile:pathatomically:YES];

复制代码

4.2、存储到手机的图片库中



C代码

1. CGImageRef screen = UIGetScreenImage();   
   
2. UIImage* image = [UIImage imageWithCGImage:screen];   
   
3. CGImageRelease(screen);   
   
4. UIImageWriteToSavedPhotosAlbum(image, self, nil, nil);  
   
5. 
   
6. CGImageRef screen = UIGetScreenImage();
   
7. UIImage* image = [UIImage imageWithCGImage:screen];
   
8. CGImageRelease(screen);
   
9. UIImageWriteToSavedPhotosAlbum(image, self, nil, nil);

复制代码

有些没有实验，错误见谅~~

阳光的扣子

谢谢分享