ios - 当系统 UIAlertView 关闭时通知

Question

我正在尝试使用新的照片框架，但我似乎找不到在“允许访问照片”警报 View 完成时收到通知的方法。有什么想法吗？

我尝试通过通知来做到这一点。

[[NSNotificationCenter defaultCenter] addObserverForName:UIWindowDidResignKeyNotification object:self queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note) {
    //figure out the result of the request
    // This never gets called
}];

Answer 1

使用提供的 API，它可以准确地满足您的需求。

+[PHPhotoLibrary requestAuthorization:(void (^)(PHAuthorizationStatus status))handler]

This method always returns immediately. If the user has previously granted or denied photo library access permission, it executes the handler block when called; otherwise, it displays an alert and executes the block only after the user has responded to the alert.