iphone-common-codes-ccteam源代码 CCUIImage.m-优快云博客

本文提供了一系列针对UIImage的操作方法，包括图片缩放、调整大小、保存为PNG文件、保存到照片相册、获取图片部分区域及从文本生成图片等。此外还提供了获取全屏截图的方法。

//  
//  CCUIImage.m  
//  CCFC  
//  
//  Created by xichen on 11-12-24.  
//  Copyright 2011 ccteam. All rights reserved.  
//
  





@implementation UIImage(cc)  


// returns the scaled image  
- (UIImage *)scale:(float)scaleSize  
{  

        UIGraphicsBeginImageContext(  
                        CGSizeMake(self.size.width * scaleSize, self.size.height * scaleSize));  
        [self drawInRect:CGRectMake(0, 0, self.size.width * scaleSize, self.size.height * scaleSize)];  
        UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();  
        UIGraphicsEndImageContext();  

return scaledImage;  
}  


// resize the img to indicated newSize  
- (UIImage *)resizeImage:(CGSize)newSize  
{  
        UIGraphicsBeginImageContext(CGSizeMake(newSize.width, newSize.height));  
        [self drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];  
        UIImage *resizeImage = UIGraphicsGetImageFromCurrentImageContext();  
        UIGraphicsEndImageContext();  


return resizeImage;  

}  


// save PNG file to path  
- (BOOL)savePNGToPath:(NSString *)fileFullPath  
{  
return [UIImagePNGRepresentation(self) writeToFile:fileFullPath atomically:YES];  
}  


// save the img to photos album  
- (void)saveImgToPhotosAlbum  
{  
        UIImageWriteToSavedPhotosAlbum(self, nil, nil, nil);  
}  


// get part of the image  
- (UIImage *)getPartOfImage:(CGRect)partRect  
{  
        CGImageRef imageRef = self.CGImage;  
        CGImageRef imagePartRef = CGImageCreateWithImageInRect(imageRef, partRect);  
return [UIImage imageWithCGImage:imagePartRef];  
}  


// returns UIImage * from text  
+ (UIImage *)imageFromText:(NSString *)text font:(UIFont *)font  
{              
        CGSize size  = [text sizeWithFont:font];       
        UIGraphicsBeginImageContext(size);    

        CGContextRef ctx = UIGraphicsGetCurrentContext();         
        [text drawAtPoint:CGPointMake(0, 0) withFont:font];        
        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();            
        UIGraphicsEndImageContext();   
        CGContextRelease(ctx);  

return image;    
}   


#if CC_ENABLE_PRIVATE_API && CC_COMPILE_PRIVATE_CLASS  
+ (UIImage *)getFullScreenImg  
{  
        CGImageRef screenImg = UIGetScreenImage();  
return [UIImage imageWithCGImage:screenImg];  
}  
#endif  


@end