小编pup*_*its的帖子

我正在寻找创建一个类别,用许多简单的iOS API替换委托方法和回调块.与NSURLConnection上的sendAsyc块类似.有两种技术是无泄漏的,似乎工作正常.每个人的利弊是什么？有没有更好的办法？

选项1.使用类别在NSObject上实现委托的回调方法,并使用外部回调块作用域.

// Add category on NSObject to respond to the delegate
@interface NSObject(BlocksDelegate)
- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;
@end

@implementation NSObject(BlocksDelegate)
- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    // Self is scoped to the block that was copied
    void(^callback)(NSInteger) = (id)self;
    // Call the callback passed if
    callback(buttonIndex);
    [self release];
}
@end

// Alert View Category
@implementation UIAlertView (BlocksDelegate)
+ (id) alertWithTitle:(NSString*)title
              message:(NSString*)message
         clickedBlock:(void(^)(NSInteger))buttonIndexClickedBlock
    cancelButtonTitle:(NSString*)cancelButtonTitle
    otherButtonTitles:(NSString*)otherButtonTitles
{
    // Copy block passed in to the Heap and will stay alive …

您可以使用不同的加载器加载辅助条目吗？

例如,我正在尝试为脱机缓存创建服务工作者.我已经排除了包含服务工作者的文件夹,并将其包含在另一个文件夹中.没有调用service-worker.js(它只是在静态index.html中手动加载).服务工作者入口点正在拾取React和热门加载器,而不仅仅是通过Babel.这是我配置的重要部分.

entry: {
     app: "app.js",
     'service-worker': 'persistence/service-worker.js'
},
module: {
    loaders:[{
        test: /\.js|\.jsx/,
        loaders: ["react-hot", "jsx?harmony", "babel"],
        exclude: /persistence/
    }, {
        test: /service\-worker\.js/,
        loaders: ["babel"],
        include: /persistence/
  }]