ios 常用小技巧

1. 跳转到设置

NSURL *url = [NSURLURLWithString:UIApplicationOpenSettingsURLString];
if( [[UIApplication sharedApplication] canOpenURL:url] ) {
    [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:^(BOOL  success) {}];
}

2. iOS提示代码失效

- (void)JX_Device_Permission_Check_CameraAuth:(CheckPermissionCameraAuth)permission NS_DEPRECATED_IOS(2_0, 9_0,"******");

3. iOS代理提示问题
Assigning to 'id<UINavigationControllerDelegate,UIImagePickerControllerDelegate> _Nullable' from incompatible type 'ViewController *const __strong'

- (UIImagePickerController *)imagePickerController {
    if (!_imagePickerController) {
        _imagePickerController  = [[UIImagePickerController alloc] init];
        _imagePickerController.allowsEditing    = NO;
       // _imagePickerController.delegate = self; // 此处self会提示如题，更改方式是
        _imagePickerController.delegate = (id)self;
    }
    return _imagePickerController;
}