iphone 中的图片选取器 UIImagePickerController以前没有怎么看,现在看了看,总结下
【一】初始化
UIImagePickerController就是普通的初始化,最重要的就是那个 sourceType 这个属性
UIImagePickerController *pick=[[UIImagePickerController alloc]init];
UIImagePickerControllerSourceTypePhotoLibrary:表示显示所有的照片
UIImagePickerControllerSourceTypeCamera:表示从摄像头选取照片
UIImagePickerControllerSourceTypeSavedPhotosAlbum:表示仅仅从相册中选取照片。
【二】UIImagePickerController的使用
UIImagePickerController有三个代理方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo //ios3之后已经抛弃不再使用 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info; - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;
因为第一个在 ios2和 ios3之后都不用了,所以主要用后面的两个,还有就是在切换的时候最新的使用presentViewController这个方法
【三】方法示例
主要的代码是这样的,demo 里面是完整的代码,如果需要可以下载 demo,这里主要说下主要功能
- (void)viewDidLoad { [super viewDidLoad]; UIButton *button=[[UIButton alloc]initWithFrame:CGRectMake(100, 100, 160, 40)]; [button setTitle:@"点击测试相机" forState:UIControlStateNormal]; [button setTitleColor:[UIColor redColor] forState:UIControlStateNormal]; [self.view addSubview:button]; [button addTarget:self action:@selector(imagefun) forControlEvents:UIControlEventTouchUpInside]; imageview =[[UIImageView alloc]initWithFrame:CGRectMake(100, 150, 200, 200)]; [self.view addSubview:imageview]; } -(void)imagefun { UIActionSheet *action=[[UIActionSheet alloc]initWithTitle:@"选择功能" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:@"相机" otherButtonTitles:@"相册",nil]; [action showInView:self.view]; } //actionsheet 总共有两个功能,相册和相机 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex { //主要是使用这个controller UIImagePickerController *pick=[[UIImagePickerController alloc]init]; if (buttonIndex==0) { NSLog(@"相机"); //判断相机是否可用,因为模拟机是不可以的 if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { pick.sourceType=UIImagePickerControllerSourceTypeCamera;//设置 pick 的类型为相机 pick.allowsEditing=true;//设置是否可以编辑相片涂鸦 pick.delegate=self; [self presentViewController:pick animated:true completion:nil]; } else { NSLog(@"相机不可用"); } } else if (buttonIndex==1) { NSLog(@"相册"); //判断相册是否可用 if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) { pick.sourceType=UIImagePickerControllerSourceTypePhotoLibrary; pick.allowsEditing=true; pick.delegate=self; [self presentViewController:pick animated:true completion:nil]; } else { NSLog(@"相册不可用"); } } else { NSLog(@"取消"); } } ///代理方法 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { NSLog(@"xuanze"); NSString *type=[info objectForKey:UIImagePickerControllerMediaType]; //判断选择的是否是图片,这个 public.image和public.movie是固定的字段. if ([type isEqualToString:@"public.image"]) { //其实这样就已经实现了设置图片的功能 UIImage *image=[info objectForKey:UIImagePickerControllerOriginalImage]; //这一步主要是判断当是用相机拍摄的时候,保存到相册 if (picker.sourceType==UIImagePickerControllerSourceTypeCamera) { UIImageWriteToSavedPhotosAlbum(image, self, nil, nil); } [imageview setImage:image]; //这里再加个写入到本地的方案 //获取写入的文件夹 NSString *documents=[NSHomeDirectory() stringByAppendingString:@"/Documents"]; //也可以用下面这个,区别就是加不加/ //NSString *documents=[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; //将 image 转换为 data NSData *data; if (UIImagePNGRepresentation(image)) { data=UIImagePNGRepresentation(image); } else data=UIImageJPEGRepresentation(image, 1.0); NSFileManager *filemanager=[NSFileManager defaultManager]; //避免覆盖 static int i=0; i++; [filemanager createFileAtPath:[documents stringByAppendingFormat:@"/%d.png",i] contents:data attributes:nil]; } //判断选择的是否是视频 if ([type isEqualToString:@"public.movie"]) { } [picker dismissViewControllerAnimated:false completion:nil]; } - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { NSLog(@"取消"); [picker dismissViewControllerAnimated:false completion:nil]; }
【四】demo下载
Github下载:https://github.com/DamonHu/hudongImagePicker
GitOsc下载:http://git.oschina.net/DamonHoo/hudongImagePicker
版权属于:东哥笔记 - DongGe.org
本文链接:http://dongge.org/blog/142.html
自2017年12月26日起,『转载以及大段采集进行后续编辑』须注明本文标题和链接!否则禁止所有转载和采集行为!