获取相机、麦克风、通讯录权限，确认是否拥有这些权限

请求系统设置隐私中 相机 权限

代码如下：

[AVCaptureDevice requestAccessForMediaType:AVMediaTypeAudio completionHandler:^(BOOL granted) {
PRINT("requestAccessForMediaTypeAudio granted:%d", granted)
}];

请求系统设置隐私中 麦克风 权限
代码如下：

[AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
PRINT("requestAccessForMediaTypeVideo granted:%d", granted)
}];

请求系统设置隐私中 通讯录 权限
代码如下：

if (ABAddressBookRequestAccessWithCompletion != NULL) {
ABAddressBookRef addressBookRef = ABAddressBookCreate();
dispatch_semaphore_t sema = dispatch_semaphore_create(0);
ABAddressBookRequestAccessWithCompletion(_addressBookRef, ^(bool granted, CFErrorRef error) {
PRINT("granted:%d", granted)
dispatch_semaphore_signal(sema);
});
dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
dispatch_release(sema);
}

确认是否拥有 相机、麦克风 权限

NSString *mediaType = isVideo ? AVMediaTypeVideo : AVMediaTypeAudio;AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:mediaType];（AVMediaTypeVideo--->相机；AVMediaTypeAudio--->麦克风）其中status为下面几种状态之一typedef enum : NSInteger { AVAuthorizationStatusNotDetermined = 0, AVAuthorizationStatusRestricted, AVAuthorizationStatusDenied, AVAuthorizationStatusAuthorized} AVAuthorizationStatus;

确认是否拥有 通讯录 权限：

ABAuthorizationStatus status =ABAddressBookGetAuthorizationStatus();

其中status为下面几种状态之一

typedef CF_ENUM(CFIndex, ABAuthorizationStatus) {
kABAuthorizationStatusNotDetermined = 0,
kABAuthorizationStatusRestricted,
kABAuthorizationStatusDenied,
kABAuthorizationStatusAuthorized
};