ios - 在 iOS 8 中呈现相机权限对话框

Question

当我的应用在 iOS 8 上首次尝试访问摄像头时，用户会看到一个摄像头权限对话框，很像 iOS 7 中用于麦克风访问的麦克风对话框。

在 iOS 7 中，可以预先调用麦克风权限对话框并查看权限是否被授予(例如，参见 this question)。在 iOS 8 中是否有类似的方法来调用相机权限对话框？是否可以将对话框合并为麦克风和摄像头访问权限？

Answer 1

这是我们最终使用的方法:

if ([AVCaptureDevice respondsToSelector:@selector(requestAccessForMediaType: completionHandler:)]) {
    [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
        // Will get here on both iOS 7 & 8 even though camera permissions weren't required 
        // until iOS 8. So for iOS 7 permission will always be granted.
        if (granted) {
            // Permission has been granted. Use dispatch_async for any UI updating
            // code because this block may be executed in a thread.
            dispatch_async(dispatch_get_main_queue(), ^{
                [self doStuff];
            });                
        } else {
            // Permission has been denied.
        }
    }];
} else {
    // We are on iOS <= 6. Just do what we need to do.
    [self doStuff];
}