UIAlertController的使用+唤醒相机|相册的使用

@interface ViewController ()<UIActionSheetDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate>@property (nonatomic, strong) UIImageView *chooseView;@property (nonatomic, strong) UIButton *openCameraBtn;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor darkGrayColor];    //加载从相册中选择的图片    self.chooseView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];    self.chooseView.backgroundColor = [UIColor cyanColor];    [self.view addSubview:self.chooseView];        //开启系统相机|相册    self.openCameraBtn = [UIButton buttonWithType:UIButtonTypeCustom];    self.openCameraBtn.frame = CGRectMake(100, 350, 200, 40);    [self.openCameraBtn setTitle:@"开启系统相机|相册" forState:UIControlStateNormal];    [self.openCameraBtn setBackgroundColor:[UIColor orangeColor]];    [self.openCameraBtn addTarget:self action:@selector(openSystemCamera) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:self.openCameraBtn];}/* UIImagePickerController(图片拾取器） 能够根据不同的额指令，选择开启相机或者系统相册  ps:使用图片拾取器的时候，都别忘了实现两个协议 UIImagePickerControllerDelegate, UINavigationControllerDelegate  pss:模拟器和某些设备不支持开启相机，所以在开启相机功能执行之前，有必要判断当前设备是否存在相机 */- (void)openSystemCamera{        UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"提示" message:@"开启系统相机|相册" preferredStyle:UIAlertControllerStyleActionSheet];// UIAlertControllerStyleAlert(警告框)//Ps:UIAlertControllerStyleAlert(警告框)还可以添加TextField,UIAlertControllerStyleActionSheet不可以`；/*添加文本框    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {        textField.textColor = [UIColor redColor];        //给文本框设置监听(这是这里面的特殊用法，一般情况下textField是不能设置监听的)        [textField addTarget:self action:@selector(doSomething:) forControlEvents:UIControlEventEditingChanged];    }];*/        [alertVC addAction:[UIAlertAction actionWithTitle:@"相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action){        //创建图片拾取器        UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];        //设置代理        imagePicker.delegate = self;        //设置图片拾取器类型（相机还是相册）        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;        //是否允许图片编辑        imagePicker.allowsEditing = YES;        //唤醒相机        [self presentViewController:imagePicker animated:YES completion:nil];    }]];        [alertVC addAction:[UIAlertAction actionWithTitle:@"系统相册" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {        UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];        imagePicker.delegate = self;        imagePicker.allowsEditing = YES;        [self presentViewController:imagePicker animated:YES completion:nil];    }]];        [alertVC addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];        [self presentViewController:alertVC animated:YES completion:nil];    }#pragma maker -#pragma mark - 回调方法- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{    //完成获取图片的操作//    NSLog(@"%@",info);        UIImage *chooseImage = [info objectForKey:@"UIImagePickerControllerEditedImage"];        self.chooseView.image = chooseImage;        //将图片从系统相册当中取出，并存到应用的沙盒中    NSString *homPath = [NSHomeDirectory() stringByAppendingPathComponent:@"/Documents"];    //路径    NSString *realPath = [homPath stringByAppendingPathComponent:[NSString stringWithFormat:@"00%d.image",arc4random()%10000]];        //图片存入沙盒    [UIImageJPEGRepresentation(chooseImage, 1.0f) writeToFile:realPath atomically:YES];        [self dismissViewControllerAnimated:YES completion:nil];        }