IOS_OC_调用系统相机和相册

效果图:

效果图

步骤:

1.配置info.plist文件中调用相机和相册的权限

image

2.设置弹框添加事件

3.判断并申请权限

4.调起系统相册和相机

直接上代码:

#import "ViewController.h"
#pragma mark - 01.使用相机相册要导入头文件的
#import 
#import 
#import 

@interface ViewController ()
#pragma mark - 02.拖线一个imageView控件用来展示选中的图片 & 创建一个弹框;
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (nonatomic, strong) UIImagePickerController *imagePickerController;
@end

@implementation ViewController
#pragma mark - 03.懒加载初始化弹框;
- (UIImagePickerController *)imagePickerController {
    if (_imagePickerController == nil) {
        _imagePickerController = [[UIImagePickerController alloc] init];
        _imagePickerController.delegate = self; //delegate遵循了两个代理
        _imagePickerController.allowsEditing = YES;
    }
    return _imagePickerController;
}
- (void)viewDidLoad {
    [super viewDidLoad];

    //MARK: - 04.给视图添加手势.(添加手势就是租给那些自己买不起selector的控件一个触发方法);
    //首先开启该视图与用户交互的开关.默认是关;
    //这个应该是个轻拍手势;
    self.imageView.userInteractionEnabled = YES;
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageViewIsSelector)];

    [self.imageView addGestureRecognizer:tap];
}

#pragma mark - 05.在租来的触发方法里添加事件;
- (void)imageViewIsSelector {

    //MARK: - 06.点击图片调起弹窗并检查权限;
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];

    UIAlertAction *camera = [UIAlertAction actionWithTitle:@"使用相机拍摄" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        [self checkCameraPermission];//调用检查相机权限方法
    }];
    UIAlertAction *album = [UIAlertAction actionWithTitle:@"从相册中选择" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        [self checkAlbumPermission];//调起检查相册权限方法
    }];
    UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * action) {
        [self dismissViewControllerAnimated:YES completion:nil];
    }];

    [alert addAction:camera];
    [alert addAction:album];
    [alert addAction:cancel];

    [self presentViewController:alert animated:YES completion:nil];
}

#pragma mark - Camera(检查相机权限方法)
- (void)checkCameraPermission {
    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if (status == AVAuthorizationStatusNotDetermined) {
        [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
            if (granted) {
                [self takePhoto];
            }
        }];
    } else if (status == AVAuthorizationStatusDenied || status == AVAuthorizationStatusRestricted) {

        [self alertAlbum];//如果没有权限给出提示
    } else {
        [self takePhoto];//有权限进入调起相机方法
    }
}

- (void)takePhoto {
#pragma mark - 07.判断相机是否可用，如果可用调起
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        self.imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
        [self presentViewController:self.imagePickerController animated:YES completion:^{

        }];
    } else {//不可用只能GG了
        NSLog(@"木有相机");
    }
}
#pragma mark - Album(相册流程与相机流程相同,相册是不存在硬件问题的,只要有权限就可以直接调用)
- (void)checkAlbumPermission {
    PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
    if (status == PHAuthorizationStatusNotDetermined) {
        [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
            dispatch_async(dispatch_get_main_queue(), ^{
                if (status == PHAuthorizationStatusAuthorized) {
                    [self selectAlbum];
                }
            });
        }];
    } else if (status == PHAuthorizationStatusDenied || status == PHAuthorizationStatusRestricted) {
        [self alertAlbum];
    } else {
        [self selectAlbum];
    }
}

- (void)selectAlbum {
    //判断相册是否可用
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
        self.imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentViewController:self.imagePickerController animated:YES completion:^{

        }];
    }
}

- (void)alertAlbum {
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:@"请在设置中打开相册" preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        [self dismissViewControllerAnimated:YES completion:nil];
    }];
    [alert addAction:cancel];
    [self presentViewController:alert animated:YES completion:nil];
}
#pragma mark - UIImagePickerControllerDelegate(最后一步,选完就把图片加上就完事了)
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    [picker dismissViewControllerAnimated:YES completion:nil];
    UIImage *image = [info valueForKey:UIImagePickerControllerEditedImage];
    self.imageView.image = image;
}

@end

基本上就大功告成了

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