相机相册的正确打开方式

** 直接上代码: **

导入

#import <AVFoundation/AVFoundation.h>
#import <Photos/Photos.h>

一个金典的宏定义

// 从 SDWebImage 中学来的
#define dispatch_main_async_safe(block)\
    if ([NSThread isMainThread]) {\
        block();\
    } else {\
        dispatch_async(dispatch_get_main_queue(), block);\
    }

打开相册的完整流程

// 打开相册的完整流程
- (void)openPhotosAlbum {
    // 进入相册
    void (^openBlock) () = ^{
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
        {
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            picker.delegate = self;
            picker.sourceType    = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
            [self presentViewController:picker animated:YES completion:nil];
        } else {
            NSLog(@"不能打开了");
        }
    };
    
    // 使用 PHPhotoLibrary
    [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
        
        // 先定义一个block
        void (^photosBlock)() = ^{
            switch (status) {
                case PHAuthorizationStatusNotDetermined:
                {
                    // 没有确认过
                    NSLog(@"不处理");
                }
                    break;
                case PHAuthorizationStatusRestricted:
                {
                    // 暂未使用
                    NSLog(@"被拒绝");
                }
                    break;
                case PHAuthorizationStatusDenied:
                {
                    // 点击了不允许
                    NSLog(@"被否认");
                }
                    break;
                case PHAuthorizationStatusAuthorized:
                {
                    // 同意
                    NSLog(@"可以 直接通过 PHFetchOptions 获取, 或者打开系统的相册");
                    openBlock();
                }
                    break;
                    
                default:
                    break;
            }
        };
        
        // 保证在主线程中获取相册中的图片
        dispatch_main_async_safe(photosBlock);
        
    }];
}

打开相机的完整流程(或者是仅仅获取相册中的图片)

// 打开相机的完整流程
- (void)openCamera {
    
    // 进入相机
    void (^openBlock) () = ^{
        UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        {
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            picker.delegate = self;
            picker.sourceType    = sourceType;
            [self presentViewController:picker animated:YES completion:nil];
        } else {
            NSLog(@"不能打开了");
        }
    };
    
    
    // 权限判断
    NSString *mediaType = AVMediaTypeVideo;
    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
    
    switch (status) {
        case AVAuthorizationStatusNotDetermined:
        {
            // 第一次访问
            NSLog(@"没有确认过");
            
            // 需要问一下,弹出是否同意提示框
            [AVCaptureDevice requestAccessForMediaType:mediaType completionHandler:^(BOOL granted) {
                
                if(granted){
                    NSLog(@"同意");
                    // 进入相机
                    openBlock();
                } else {
                    NSLog(@"不同意");
                    
                }
                
            }];
        }
            break;
        case AVAuthorizationStatusRestricted:
        {
            // (此状态,暂未使用)
            NSLog(@"被拒绝");
        }
            break;
        case AVAuthorizationStatusDenied:
        {
            NSLog(@"被否认过");
        }
            break;
        case AVAuthorizationStatusAuthorized:
        {
            // 允许访问
            NSLog(@"允许访问");
            
            // 进入相机
            openBlock();
        }
            break;
            
        default:
        {
            NSLog(@"未知状态");
        }
            break;
    }
    
    
}

代理 UINavigationControllerDelegate, UIImagePickerControllerDelegate

#pragma mark -
#pragma mark - UINavigationControllerDelegate, UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *, id> *)info
{
    UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
    
    NSLog(@"%@", image);
    
    [self imagePickerControllerDidCancel:picker];
}

// 取消操作
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [picker dismissViewControllerAnimated:YES completion:nil];
}

要记得设置下面两个东东

** Privacy - Camera Usage Description **
** Privacy - Photo Library Usage Description **

忘记了也木有关系,反正会以 ** 闪退** 的方式来进行提示的.

谢谢~