iOS开发-调用系统相机和相册获取照片示例

#import "HeaderPhotoViewController.h"

@interface HeaderPhotoViewController ()

@property (nonatomic, strong) UIImageView * imageView;

@end

@implementation HeaderPhotoViewController

- (void)viewDidLoad {

  [super viewDidLoad];

  self.navigationItem.title = @"设置头像";

  self.view.backgroundColor = [UIColor whiteColor];

  [self setNavigation];

  [self addSubviews];

  [self makeConstraintsForUI];

}

#pragma mark - set navigation

- (void)setNavigation {

  self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(selectPhoto:)];

}

#pragma mark - navitation item action

- (void)selectPhoto:(UIBarButtonItem *)itemCamera {

  //创建UIImagePickerController对象，并设置代理和可编辑

  UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];

  imagePicker.editing = YES;

  imagePicker.delegate = self;

  imagePicker.allowsEditing = YES;

  //创建sheet提示框，提示选择相机还是相册

  UIAlertController * alert = [UIAlertController alertControllerWithTitle:@"请选择打开方式"message:nil preferredStyle:UIAlertControllerStyleActionSheet];

  //相机选项

  UIAlertAction * camera = [UIAlertAction actionWithTitle:@"相机"style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

    //选择相机时，设置UIImagePickerController对象相关属性

    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

    imagePicker.modalPresentationStyle = UIModalPresentationFullScreen;

    imagePicker.mediaTypes = @[(NSString *)kUTTypeImage];

    imagePicker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;

    //跳转到UIImagePickerController控制器弹出相机

    [self presentViewController:imagePicker animated:YES completion:nil];

  }];

  //相册选项

  UIAlertAction * photo = [UIAlertAction actionWithTitle:@"相册"style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

    //选择相册时，设置UIImagePickerController对象相关属性

    imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    //跳转到UIImagePickerController控制器弹出相册

    [self presentViewController:imagePicker animated:YES completion:nil];

  }];

  //取消按钮

  UIAlertAction * cancel = [UIAlertAction actionWithTitle:@"取消"style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {

    [self dismissViewControllerAnimated:YES completion:nil];

  }];

  //添加各个按钮事件

  [alert addAction:camera];

  [alert addAction:photo];

  [alert addAction:cancel];

  //弹出sheet提示框

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

}

#pragma mark - add subviews

- (void)addSubviews {

  [self.view addSubview:self.imageView];

}

#pragma mark - make constraints

- (void)makeConstraintsForUI {

  __weak typeof(self)weakSelf = self;

  [_imageView mas_makeConstraints:^(MASConstraintMaker *make) {

    make.size.mas_equalTo(CGSizeMake(Screen_Width, Screen_Width));

    make.centerX.mas_equalTo(weakSelf.view.mas_centerX);

    make.centerY.mas_equalTo(weakSelf.view.mas_centerY);

  }];

}

#pragma mark - imagePickerController delegate

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary*)info {

  [picker dismissViewControllerAnimated:YES completion:nil];

  //获取到的图片

  UIImage * image = [info valueForKey:UIImagePickerControllerEditedImage];

  _imageView.image = image;

}

#pragma mark - setter and getter

- (UIImageView *)imageView {

  if(!_imageView) {

    _imageView = [[UIImageView alloc] init];

    _imageView.backgroundColor = [UIColor greenColor];

    _imageView.contentMode = UIViewContentModeScaleAspectFill;

  }

  return_imageView;

}

@end