《iOS判断应用是否获取到系统相机 相册的授权 以及如何请求授权》

</pre><pre code_snippet_id="1815940" snippet_file_name="blog_20160808_1_3554133" name="code" class="objc"><pre name="code" class="objc"> //判断当前应用是否能访问相册资源

    /*

    typedef NS_ENUM(NSInteger, ALAuthorizationStatus) {

    ALAuthorizationStatusNotDetermined = 0, 用户尚未做出了选择这个应用程序的问候

    ALAuthorizationStatusRestricted,        此应用程序没有被授权访问的照片数据。可能是家长控制权限。

    ALAuthorizationStatusDenied,            用户已经明确否认了这一照片数据的应用程序访问.

    ALAuthorizationStatusAuthorized        用户已授权应用访问照片数据.

    }

    */

<pre name="code" class="objc">首先导入 AssetsLibrary.framework AVFoundation库 导入头文件

#import <AVFoundation/AVFoundation.h>

#import <AssetsLibrary/AssetsLibrary.h>

/**

*  调用系统相机

*/

- (void)callCamera

{

    //判断是否已授权

    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {

        AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

        if (authStatus == ALAuthorizationStatusDenied||authStatus == ALAuthorizationStatusRestricted) {

            [self setAlertControllerWithTitle:@"提示" message:@"请前往设置->隐私->相机授权应用拍照权限" actionTitle:@"确定"];

            return ;

        }

    }

    // 判断是否可以打开相机

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];

        picker.delegate = self;

        picker.allowsEditing = YES;

        picker.sourceType = UIImagePickerControllerSourceTypeCamera;

        [self presentViewController:picker animated:YES completion:nil];

    } else {

        [self setAlertControllerWithTitle:@"提示" message:@"你没有相机" actionTitle:@"确定"];

    }

}

/**

*  调用系统相册

*/

- (void)callPhoto

{

    //判断是否已授权

    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {

        ALAuthorizationStatus authStatus = [ALAssetsLibrary authorizationStatus];

        if (authStatus == ALAuthorizationStatusDenied) {

            [self setAlertControllerWithTitle:@"提示" message:@"请前往设置->隐私->相册授权应用访问相册权限" actionTitle:@"确定"];

            return;

        }

    }

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];

        picker.delegate = self;

        picker.allowsEditing = YES;

        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

        //self.isReload = NO;

        [self presentViewController:picker animated:YES completion:nil];

    } else {

        [self setAlertControllerWithTitle:@"提示" message:@"你没有相册" actionTitle:@"确定"];

    }

}