iOS开发-调用系统相机和相册获取照片示例
前言:相信大家都知道大部分的app都是有我的模块的,而在我的模块基本都有用户的头像等信息,并且是可以更改头像的。那么今天小编给大家简单介绍一下iOS开发中如何调用系统相机拍照或者相册获取照片。要获取系统相机或者相册,我们需要使用到UIImagePickerController这个类。下面我们来看一下如何实现:
首先,需要遵循UIImagePickerController代理的两个协议:<UIImagePickerControllerDelegate,UINavigationControllerDelegate>。为什么是两个协议呢?你按着command键,点击UIImagePickerController的delegate就会发现其实这个代理遵循了两个协议。
#import"HeaderPhotoViewController.h" @interfaceHeaderPhotoViewController()<UIImagePickerControllerDelegate,UINavigationControllerDelegate> @property(nonatomic,strong)UIImageView*imageView; @end @implementationHeaderPhotoViewController -(void)viewDidLoad{ [superviewDidLoad]; self.navigationItem.title=@"设置头像"; self.view.backgroundColor=[UIColorwhiteColor]; [selfsetNavigation]; [selfaddSubviews]; [selfmakeConstraintsForUI]; } #pragmamark-setnavigation -(void)setNavigation{ self.navigationItem.rightBarButtonItem=[[UIBarButtonItemalloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCameratarget:selfaction:@selector(selectPhoto:)]; } #pragmamark-navitationitemaction -(void)selectPhoto:(UIBarButtonItem*)itemCamera{ //创建UIImagePickerController对象,并设置代理和可编辑 UIImagePickerController*imagePicker=[[UIImagePickerControlleralloc]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=[UIAlertControlleralertControllerWithTitle:@"请选择打开方式"message:nilpreferredStyle:UIAlertControllerStyleActionSheet]; //相机选项 UIAlertAction*camera=[UIAlertActionactionWithTitle:@"相机"style:UIAlertActionStyleDefaulthandler:^(UIAlertAction*_Nonnullaction){ //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 [selfpresentViewController:imagePickeranimated:YEScompletion:nil]; }]; //相册选项 UIAlertAction*photo=[UIAlertActionactionWithTitle:@"相册"style:UIAlertActionStyleDefaulthandler:^(UIAlertAction*_Nonnullaction){ //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 [selfpresentViewController:imagePickeranimated:YEScompletion:nil]; }]; //取消按钮 UIAlertAction*cancel=[UIAlertActionactionWithTitle:@"取消"style:UIAlertActionStyleCancelhandler:^(UIAlertAction*_Nonnullaction){ [selfdismissViewControllerAnimated:YEScompletion:nil]; }]; //添加各个按钮事件 [alertaddAction:camera]; [alertaddAction:photo]; [alertaddAction:cancel]; //弹出sheet提示框 [selfpresentViewController:alertanimated:YEScompletion:nil]; } #pragmamark-addsubviews -(void)addSubviews{ [self.viewaddSubview:self.imageView]; } #pragmamark-makeconstraints -(void)makeConstraintsForUI{ __weaktypeof(self)weakSelf=self; [_imageViewmas_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); }]; } #pragmamark-imagePickerControllerdelegate -(void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary<NSString*,id>*)info{ [pickerdismissViewControllerAnimated:YEScompletion:nil]; //获取到的图片 UIImage*image=[infovalueForKey:UIImagePickerControllerEditedImage]; _imageView.image=image; } #pragmamark-setterandgetter -(UIImageView*)imageView{ if(!_imageView){ _imageView=[[UIImageViewalloc]init]; _imageView.backgroundColor=[UIColorgreenColor]; _imageView.contentMode=UIViewContentModeScaleAspectFill; } return_imageView; } @end
OK!demo的所有代码都已经给大家呈现出来了,最后一步就是配置plist文件,千万不要忘了这个,要不会崩的。plist文件里边添加调用相机的字段Privacy-CameraUsageDescription和调用相册的字段:Privacy-PhotoLibraryUsageDescription。万事俱备,就差一个测试的苹果手机了,相机的测试需要使用真机测试。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持毛票票。