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
取得图片的代码
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。
时间： 2024-12-16 21:33:50