这里主要用到了UIImagePickerController
不多废话，直接上代码
1 // 2 // RootViewController.m 3 // GetImageFromPhotoAlbum 4 // 5 // Created by 王云龙 on 16/1/18. 6 // Copyright © 2016年 王云龙. All rights reserved. 7 // 8 9 #import "RootViewController.h" 10 #import "SecViewController.h" 11 12 @interface RootViewController ()<UIActionSheetDelegate,UINavigationControllerDelegate, UIImagePickerControllerDelegate> 13 14 { 15 UIImageView *_imageView; 16 UIImageView *_imageViewR; 17 } 18 19 @end 20 21 @implementation RootViewController 22 23 24 /** 25 * 1.导航器 26 * 2.UIImagePickerController 27 * 3.iOS文件存取，沙盒机制 28 */ 29 30 - (void)viewDidLoad 31 { 32 [super viewDidLoad]; 33 // Do any additional setup after loading the view. 34 35 #pragma mark - 导航器设置 36 [self.navigationController.navigationBar setTranslucent:NO];//设置navigationbar的半透明 37 NSLog(@"frame = %@,bounds = %@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.window.bounds)); 38 self.title = @"navigationcontroller";//设置navigationbar上显示的标题 39 [self.navigationController.navigationBar setBarTintColor:[UIColor purpleColor]];//设置navigationbar的颜色 40 41 UIBarButtonItem *left = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(leftAction:)]; 42 self.navigationItem.leftBarButtonItem = left; //设置navigationbar左边按钮 43 44 self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(rightAction:)];//设置navigationbar右边按钮 45 [self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];//设置navigationbar上左右按钮字体颜色 46 47 #pragma mark - 画面初始化 48 _imageViewR = [[UIImageView alloc]initWithFrame:CGRectMake(16, 20, 100, 100)]; 49 _imageViewR.backgroundColor = [UIColor grayColor]; 50 [self.view addSubview:_imageViewR]; 51 52 _imageView = [[UIImageView alloc]initWithFrame:CGRectMake(16, 140, self.view.frame.size.width-32, self.view.frame.size.width-32)]; 53 _imageView.backgroundColor = [UIColor grayColor]; 54 [self.view addSubview:_imageView]; 55 56 UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem]; 57 btn.frame = CGRectMake(16, CGRectGetMaxY(_imageView.frame)+20, self.view.frame.size.width-32, 35); 58 btn.layer.cornerRadius = 5; 59 btn.layer.masksToBounds = YES; 60 [btn setTitle:@"获取相册图片" forState:UIControlStateNormal]; 61 [btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside]; 62 [self.view addSubview:btn]; 63 64 } 65 66 #pragma mark - 导航控制器的跳转 67 -(void)leftAction:(UIBarButtonItem*)sender{ 68 //只能跳到没有没有导航控制器的controller 69 SecViewController *secVC = [[SecViewController alloc]init]; 70 [self.navigationController pushViewController:secVC animated:YES]; 71 } 72 73 -(void)rightAction:(UIBarButtonItem*)sender{ 74 //相册 75 UIImagePickerController *imagePickController = [[UIImagePickerController alloc]init]; 76 imagePickController.delegate = self; 77 imagePickController.allowsEditing = YES; 78 imagePickController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 79 [self presentViewController:imagePickController animated:YES completion:nil 80 ]; 81 82 83 } 84 85 #pragma mark - 相册中取得图片并显示 86 -(void)btnAction:(UIButton*)sender{ 87 88 UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"获取图片" message:nil preferredStyle:UIAlertControllerStyleActionSheet]; 89 90 //判断支持类型 91 //相册和图库的区别 92 //http://zhidao.baidu.com/link?url=DGZvUPsBPpArTyqP5ff2BcbVL1s_OUuH9A4TfB3Bn0xTP_iylo7Y45wAShBGZXDW85cicNPaeXSQlLiPzYCvCbDmA9gPHX5042sNfrN5ZFu 93 94 if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) 95 NSLog(@"支持相机"); 96 else 97 NSLog(@"不支持相机"); 98 99 if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) 100 NSLog(@"支持图库"); 101 else 102 NSLog(@"不支持图库"); 103 104 if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum]) 105 NSLog(@"支持相册"); 106 else 107 NSLog(@"不支持相册"); 108 109 110 111 //判断是否支持相机 112 if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { 113 UIAlertAction*defualtAction = [UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { 114 UIImagePickerController *imagePickerController = [[UIImagePickerController alloc]init]; 115 imagePickerController.delegate = self; 116 imagePickerController.allowsEditing = YES; 117 imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera; 118 [self presentViewController:imagePickerController animated:YES completion:^{}]; 119 }]; 120 [alertController addAction:defualtAction]; 121 } 122 UIAlertAction *defaultAction1 = [UIAlertAction actionWithTitle:@"从相册选择" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { 123 //相册 124 UIImagePickerController *imagePickController = [[UIImagePickerController alloc]init]; 125 imagePickController.delegate = self; 126 imagePickController.allowsEditing = YES; 127 imagePickController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; 128 [self presentViewController:imagePickController animated:YES completion:nil 129 ]; 130 131 }]; 132 UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]; 133 [alertController addAction:cancelAction]; 134 [alertController addAction:defaultAction1]; 135 136 //弹出视图 137 [self presentViewController:alertController animated:YES completion:nil]; 138 139 } 140 141 #pragma mark - 文件保存到本地 142 //http://blog.csdn.net/jianjianyuer/article/details/8556024 143 -(void)saveImage:(UIImage*)currentImage withName:(NSString*)name{ 144 //图片读取的两个方法 145 //http://blog.csdn.net/lovenjoe/article/details/7484217 146 //NSData存储二进制数据 147 //http://blog.csdn.net/jjmm2009/article/details/39004149 148 NSData *imageData = UIImagePNGRepresentation(currentImage); 149 150 //沙盒介绍 151 //http://www.cnblogs.com/taintain1984/archive/2013/03/19/2969201.html 152 NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]stringByAppendingPathComponent:name]; 153 154 //沙盒文件操作 155 //http://www.cocoachina.com/bbs/read.php?tid-78784.html 156 157 //将图片写入 158 [imageData writeToFile:fullPath atomically:YES]; 159 } 160 161 #pragma mark - UIImagePickerController的代理方法。 162 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{ 163 164 [picker dismissViewControllerAnimated:YES completion:nil]; 165 //得到原始图片，未编辑的 166 UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage]; 167 168 //判断是否图片已经读取过 169 NSString*referenceURL = [info objectForKey:UIImagePickerControllerReferenceURL]; 170 NSLog(@"%@",referenceURL); 171 //保存图片到本地 172 //文件名为时间戳，防止重名 173 NSDate *datenow = [NSDate date]; 174 NSString *timeSp = [NSString stringWithFormat:@"%lf",[datenow timeIntervalSince1970]]; 175 NSString *fileName = [NSString stringWithFormat:@"%@.png",timeSp]; 176 177 [self saveImage:image withName:fileName]; 178 179 NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]stringByAppendingPathComponent:fileName]; 180 181 182 UIImage *saveImage = [[UIImage alloc]initWithContentsOfFile:fullPath]; 183 184 //设置图片显示 185 [_imageView setImage:saveImage]; 186 [_imageViewR setImage:image]; 187 } 188 189 -(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{ 190 [picker dismissViewControllerAnimated:YES completion:nil]; 191 } 192 193 194 - (void)didReceiveMemoryWarning { 195 [super didReceiveMemoryWarning]; 196 // Dispose of any resources that can be recreated. 197 } 198 199 200 @end
注意点
需要设置的三个重要属性
delegate:代理，必须设置，否则选择图片后页面跳转不会来，也取不到选取的图片
allowEditing:最好设置为yes，否则看不到原图，只能在图片墙上选取图片
souceType:图片来源，有三个，照片流，图库，相机，区别和用法请参考代码
两个重要的代理方法
请参考代码，但是两个代理方法中都要写模态跳转，系统是不会自己跳回来的。