iPhone UIImage保存到文件，PNG／JPEG自适应

iPhone UIImage保存到文件，PNG／JPEG自适应

分类： iPhone2010-02-25
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+ (BOOL)writeImage:(UIImage*)image toFileAtPath:(NSString*)aPath

{

if ((image == nil) || (aPath == nil) || ([aPath isEqualToString:@""]))

return NO;

@try

{

NSData *imageData = nil;

NSString *ext = [aPath pathExtension];

if ([ext isEqualToString:@"png"])

imageData = UIImagePNGRepresentation(image);

else

{

// the rest, we write to jpeg

// 0. best, 1. lost. about compress.

imageData = UIImageJPEGRepresentation(image, 0);

}

if ((imageData == nil) || ([imageData length] <= 0))

return NO;

[imageData writeToFile:aPath atomically:YES];

return YES;

}

@catch (NSException *e)

{

NSLog(@"create thumbnail exception.");

}

return NO;

}