如何在iphone中以JPG或PNG格式保存圖像？

Question

我正在從UIImageView和這個圖像我正在以編程方式創建一個圖像。現在我想要以JPG或PNG格式保存在資源文件夾中的圖像。任何人都知道如何保存圖像的JPG或PNG格式？

在此先感謝！

Answer 1

這應該工作：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES); 
NSString *docs = [paths objectAtIndex:0]; 
NSString* path = [docs stringByAppendingFormat:@"/image1.jpg"]; 

NSData* imageData = [NSData dataWithData:UIImageJPEGRepresentation(imageView.image, .8)]; 
NSError *writeError = nil; 

if(![imageData writeToFile:path options:NSDataWritingAtomic error:&writeError]) { 
    NSLog(@"%@: Error saving image: %@", [self class], [writeError localizedDescription]); 
} 

Answer 2

小心。此行有一個錯誤：

UIImageJPEGRepresentation(imageView.image, 80) 

如果你看一下頭，壓縮質量應該是0（最有損）和1（最低壓縮）之間的浮動

UIKIT_EXTERN NSData *UIImageJPEGRepresentation(UIImage *image, CGFloat compressionQuality); // return image as JPEG. May return nil if image has no CGImageRef or invalid bitmap format. compression is 0(most)..1(least)