iOS开发-调用系统相机和相册获取照片示例

#import "HeaderPhotoViewController.h"@interface HeaderPhotoViewController () <UIImagePickerControllerDelegate, UINavigationControllerDelegate>@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<NSString *,id> *)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