系统AuthorizationStatus的IOS7大坑

判断的时候一定要写全4种情况

以Photos模块为例,所有的授权都分四种

1. 授权未决定(弹出框的状态)NotDetermined
2. 授权受限Restricted,当前不能接入,并不是未授权,可能是因为家长控制等等原因不能访问,很少见
3. 授权拒绝Denied,就是用户拒绝了
4. 授权接入Authorized

一般默认枚举的状态都是未决定.

typedef NS_ENUM(NSInteger, PHAuthorizationStatus) {
    PHAuthorizationStatusNotDetermined = 0, // User has not yet made a choice with regards to this application
    PHAuthorizationStatusRestricted,        // This application is not authorized to access photo data.
                                            // The user cannot change this application’s status, possibly due to active restrictions
                                            //   such as parental controls being in place.
    PHAuthorizationStatusDenied,            // User has explicitly denied this application access to photos data.
    PHAuthorizationStatusAuthorized         // User has authorized this application to access photos data.
} NS_AVAILABLE_IOS(8_0);

iOS7有什么大坑

iOS7应用被安装上的时候从未打开的时候,在”设置-隐私-相册”里是看不到app的授权状态的,甚至没有该app的图标.

所以说如果用以下代码判断,会出现一个大坑

- (BOOL)requestForPhotoAuthorization {
    //创建一个信号
    dispatch_semaphore_t sema = dispatch_semaphore_create(0);
    __block BOOL result = FALSE;
    //
    ALAuthorizationStatus status = [ALAssetsLibrary authorizationStatus];
    switch (status) {
        case ALAuthorizationStatusAuthorized:
            result = TRUE;
            break;
        default:
            break;
    }
     dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
     return result;
}

iOS7的情况下,还不能用Photos,用的是AssetLibrary,这里的大坑就是如果AssetLibrary如果没有探测到过ALAuthorizationStatusDenied,新应用在设置隐私里还是看不到app图标,此时程序通过requestForPhotoAuthorization去判断

- (void)tapGestureOnAlbumCell:(UITableViewCell *)cell {

    if ([self requestForPhotoAuthorization]) {
        //do something
    }else {
        [UIAlertView showWithMessage:@"请在 设置-隐私-照片 打开访问允许" delegate:nil];
    }
}

由于requestForPhotoAuthorization始终返回的是FALSE,会收到提醒去开放权限的Alert,但是去设置里又看不到App,造成了死循环,始终无法访问相册.

这尼玛太坑了<(=┘￣Д￣)┘╧═╧

如何解决大坑

见第一条!一定要把四种状态全部做判断

- (BOOL)requestForPhotoAuthorization {
    //创建一个信号
    dispatch_semaphore_t sema = dispatch_semaphore_create(0);
    __block BOOL result = FALSE;
    //
    ALAuthorizationStatus status = [ALAssetsLibrary authorizationStatus];
    switch (status) {
        case ALAuthorizationStatusAuthorized:
            result = TRUE;
            break;
        case ALAuthorizationStatusRestricted:
            break;
        case ALAuthorizationStatusNotDetermined:
            break;
        case ALAuthorizationStatusDenied:
            break;
        default:
            break;
    }
     dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
     return result;
}

赏

请问老板还招人么(/ω＼)

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