前言：相信大家都知道大部分的app都是有我的模塊的，而在我的模塊基本都有用戶的頭像等信息，並且是可以更改頭像的。那麼今天小編給大家簡單介紹一下IOS開發中如何調用系統相機拍照或者相冊獲取照片。要獲取系統相機或者相冊，我們需要使用到 UIImagePickerController 這個類。下面我們來看一下如何實現：

首先，需要遵循 UIImagePickerController 代理的兩個協議： <UIImagePickerControllerDelegate, UINavigationControllerDelegate>。為什麼是兩個協議呢？你按著 command 鍵，點擊 UIImagePickerController 的 delegate 就會發現其實這個代理遵循了兩個協議。

#import "HeaderPhotoViewController.h"

@interface HeaderPhotoViewController () <UIImagePickerControllerDelegate, UINavigationControllerDelegate>

@property (nonatomic, strong) UIImageView * imageView;
@end

@implementation HeaderPhotoViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  self.navigationItem.title = @"設置頭像";
  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 {

  //創建UIImagePickerController對象，並設置代理和可編輯
  UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];
  imagePicker.editing = YES;
  imagePicker.delegate = self;
  imagePicker.allowsEditing = YES;

  //創建sheet提示框，提示選擇相機還是相冊
  UIAlertController * alert = [UIAlertController alertControllerWithTitle:@"請選擇打開方式" message:nil preferredStyle:UIAlertControllerStyleActionSheet];

  //相機選項
  UIAlertAction * camera = [UIAlertAction actionWithTitle:@"相機" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

    //選擇相機時，設置UIImagePickerController對象相關屬性
    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    imagePicker.modalPresentationStyle = UIModalPresentationFullScreen;
    imagePicker.mediaTypes = @[(NSString *)kUTTypeImage];
    imagePicker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
    //跳轉到UIImagePickerController控制器彈出相機
    [self presentViewController:imagePicker animated:YES completion:nil];
  }];

  //相冊選項
  UIAlertAction * photo = [UIAlertAction actionWithTitle:@"相冊" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

    //選擇相冊時，設置UIImagePickerController對象相關屬性
    imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    //跳轉到UIImagePickerController控制器彈出相冊
    [self presentViewController:imagePicker animated:YES completion:nil];
  }];

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

    [self dismissViewControllerAnimated:YES completion:nil];
  }];

  //添加各個按鈕事件
  [alert addAction:camera];
  [alert addAction:photo];
  [alert addAction:cancel];

  //彈出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];
  //獲取到的圖片
  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

OK！demo的所有代碼都已經給大家呈現出來了，最後一步就是配置plist文件，千萬不要忘了這個，要不會崩的。plist文件裡邊添加調用相機的字段Privacy - Camera Usage Description 和調用相冊的字段：Privacy - Photo Library Usage Description。萬事俱備，就差一個測試的蘋果手機了，相機的測試需要使用真機測試。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持本站。

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