ios 判断有没有相机权限OC代码

可以使用AVCaptureDevice类的方法来判断设备是否有相机权限。以下是一个示例的Objective-C代码：

#import <AVFoundation/AVFoundation.h>

- (BOOL)isCameraPermissionGranted {
    AVAuthorizationStatus authorizationStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if (authorizationStatus == AVAuthorizationStatusAuthorized) {
        return YES;
    } else if (authorizationStatus == AVAuthorizationStatusNotDetermined) {
        __block BOOL isGranted = NO;
        dispatch_semaphore_t sema = dispatch_semaphore_create(0);
        [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
            isGranted = granted;
            dispatch_semaphore_signal(sema);
        }];
        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
        return isGranted;
    } else {
        return NO;
    }
}

使用上述方法isCameraPermissionGranted可以判断设备是否有相机权限。如果返回值为YES，则表示有相机权限；如果返回值为NO，则表示没有相机权限。当权限状态为AVAuthorizationStatusNotDetermined时，会弹出系统权限弹窗询问用户是否授权相机权限