UIImageWriteToSavedPhotosAlbum сохраняют как PNG с прозрачностью?

Question

UIImageWriteToSavedPhotosAlbum сохраняют как PNG с прозрачностью?

Вы могли сделать несколько вещей:

Сборка Ваш собственный HTTPRedirectHandler, который прерывает каждое перенаправление
, Создает экземпляр HTTPCookieProcessor и установки, что новичок так, чтобы у Вас был доступ к cookiejar.

Это - быстрая небольшая вещь, которая показывает оба

import urllib2

#redirect_handler = urllib2.HTTPRedirectHandler()

class MyHTTPRedirectHandler(urllib2.HTTPRedirectHandler):
    def http_error_302(self, req, fp, code, msg, headers):
        print "Cookie Manip Right Here"
        return urllib2.HTTPRedirectHandler.http_error_302(self, req, fp, code, msg, headers)

    http_error_301 = http_error_303 = http_error_307 = http_error_302

cookieprocessor = urllib2.HTTPCookieProcessor()

opener = urllib2.build_opener(MyHTTPRedirectHandler, cookieprocessor)
urllib2.install_opener(opener)

response =urllib2.urlopen("WHEREEVER")
print response.read()

print cookieprocessor.cookiejar

11

iphone uiimage quartz-graphics

задан erickson 10 November 2009 в 16:38

1 ответ

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iphone uiimage quartz-graphics

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score 13 · Accepted Answer

This is a problem I have noticed before and reported on the Apple Developer Forums about a year ago. As far as I know it is still an open issue.

If you have a moment, please take the time to file a feature request at Apple Bug Report. If more people report this issue, it is more likely that Apple will fix this method to output non-lossy, alpha-capable PNG.

EDIT

If you can compose your image in memory, I think something like the following would work or at least get you started:

- (UIImage *) composeImageWithWidth:(NSInteger)_width andHeight:(NSInteger)_height {
    CGSize _size = CGSizeMake(_width, _height);
    UIGraphicsBeginImageContext(_size);

    // Draw image with Quartz 2D routines over here...

    UIImage *_compositeImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return _compositeImage;
}

//
// cf. https://developer.apple.com/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/FilesandNetworking/FilesandNetworking.html#//apple_ref/doc/uid/TP40007072-CH21-SW20
//

- (BOOL) writeApplicationData:(NSData *)data toFile:(NSString *)fileName {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    if (!documentsDirectory) {
        NSLog(@"Documents directory not found!");
        return NO;
    }
    NSString *appFile = [documentsDirectory stringByAppendingPathComponent:fileName];
    return ([data writeToFile:appFile atomically:YES]);
}

// ...

NSString *_imageName = @"myImageName.png";
NSData *_imageData = [NSData dataWithData:UIImagePNGRepresentation([self composeImageWithWidth:100 andHeight:100)];

if (![self writeApplicationData:_imageData toFile:_imageName]) {
    NSLog(@"Save failed!");
}