ios 实现拍照与显示在界面上

1、添加权限与描述

2、代码

#import "ViewController.h"

@interface ViewController () <UIImagePickerControllerDelegate, UINavigationControllerDelegate>

@property (nonatomic, strong) UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 创建显示照片的imageView
    self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(50, 100, 200, 200)];
    [self.view addSubview:self.imageView];
    
    // 创建拍照按钮
    UIButton *takePhotoButton = [UIButton buttonWithType:UIButtonTypeSystem];
    [takePhotoButton setTitle:@"拍照" forState:UIControlStateNormal];
    takePhotoButton.frame = CGRectMake(50, 350, 100, 50);
    [takePhotoButton addTarget:self action:@selector(takePhoto) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:takePhotoButton];
}

- (void)takePhoto {
    // 检查相机是否可用
    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Error" message:@"相机不可用" preferredStyle:UIAlertControllerStyleAlert];
        [alert addAction:[UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil]];
        [self presentViewController:alert animated:YES completion:nil];
        return;
    }
    
    // 创建 UIImagePickerController
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    imagePicker.delegate = self;
    [self presentViewController:imagePicker animated:YES completion:nil];
}

// 拍照完成后调用的代理方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<UIImagePickerControllerInfoKey, id> *)info {
    UIImage *selectedImage = info[UIImagePickerControllerOriginalImage];
    self.imageView.image = selectedImage;
    [picker dismissViewControllerAnimated:YES completion:nil];
}

// 用户取消拍照时调用的代理方法
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [picker dismissViewControllerAnimated:YES completion:nil];
}

@end