不兼容的块指针类型 | Xcode 6.4 | iOS 8.4

Question

下面的代码工作正常，直到我将 SDWebImage 升级到 V.3.7.3，现在，它给了我一个错误。我把 ($$) 放在标记我错误的代码的开头和结尾，它在行下面 _HUD2 = [General showHUDInView:self.productImageView_ 实际上从这里开始：completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType)...

- (void)parseResponse:(NSString *)xml{
NSData *data = [xml dataUsingEncoding: NSUTF8StringEncoding];

_parserDetails3 = [[NSXMLParser alloc] initWithData:data];

[_parserDetails3 setDelegate:self];
[_parserDetails3 setShouldProcessNamespaces:YES];
[_parserDetails3 setShouldReportNamespacePrefixes:NO];
[_parserDetails3 setShouldResolveExternalEntities:NO];

if (![_parserDetails3 parse] ) {
    NSLog(@"Error de parseo");
}
else if ([_details3 count] <= 0) {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"INFORMATION", nil) message:NSLocalizedString(@"NO_DETAIL_MODAL", nil) delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];

    [alert show];
}
else {
    NSLog(@"%d", [_details3 count]);

    // Logic to fill general labels
    _estiloLabel.text = [NSString stringWithFormat:@"%@ [%@]", [[_details3 objectAtIndex:0] estilo], [[_details3 objectAtIndex:0] nombreEst]];
    _lineaLabel.text = [[_details3 objectAtIndex:0] linea];
    _fechaSolLabel.text = [[_details3 objectAtIndex:0] fechaSol];
    _chinelaLabel.text = [[_details3 objectAtIndex:0] pielChinela];
    _tuboLabel.text = [[_details3 objectAtIndex:0] pielTubo];
    _specIDLabel.text = [[_details3 objectAtIndex:0] specID];

    NSLog(@"%@", [NSString stringWithFormat: IMAGES_PATH , [[_details3 objectAtIndex:0] imagenMuestra]]);

    /*[self.productImageView setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat: IMAGES_PATH , [[_details3 objectAtIndex:0] imagenMuestra]]] placeholderImage:[UIImage imageNamed:@"cargando.gif"]];*/

    HUD2 = [General showHUDInView:self.productImageView withTitle:NSLocalizedString(@"LOADING", nil) withDetail:NSLocalizedString(@"IMAGE", nil)];
    //La solución de este método obsoleto es agregar 'sd_' a setImage (sd_setImageWithURL)
    $$[self.productImageView sd_setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat: IMAGES_PATH , [[_details3 objectAtIndex:0] imagenMuestra]]] placeholderImage:[UIImage imageNamed:nil] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType)$$ {
        [General hideHUD:HUD2];
    }];
}

[_detail3TableView reloadData];
[_detail3TableView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];

[General hideHUD:HUD];
}

Error:Incompatible block pointer types sending 'void (^)(UIImage *__strong, NSError *__strong, SDImageCacheType)' to parameter of type 'SDWebImageCompletionBlock' (aka 'void (^)(UIImage *__strong, NSError *__strong, SDImageCacheType, NSURL *__strong)')

Answer 1

错误信息告诉你你尝试传递错误类型的块：你尝试

void (^)(UIImage *__strong, NSError *__strong, SDImageCacheType)

而不是正确的

void (^)(UIImage *__strong, NSError *__strong, SDImageCacheType, NSURL *__strong)

区别在于您必须为 NSURL* 提供一个去处。他们显然更改了回调签名。您必须将代码更改为

[self.productImageView sd_setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat: IMAGES_PATH , [[_details3 objectAtIndex:0] imagenMuestra]]] placeholderImage:[UIImage imageNamed:nil] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *url) {
    [General hideHUD:HUD2];
}];

注意最后一个参数。

Answer 2

新版本需要一个额外的参数（NSURL *）（在块参数列表定义的末尾）。

Here is the commit, where this happened, in the SDWebImage repo.

不兼容的块指针类型 | Xcode 6.4 | iOS 8.4

Incompatible block pointer types | Xcode 6.4 | iOS 8.4

xcode

objective-c

uiimage

ios