照片库和照相机

1. - (void)viewDidLoad  
2. {  
3.     [super viewDidLoad];  
4.     //获取Documents文件夹目录    
5.     NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    
6.     NSString *documentPath = [path objectAtIndex:0];    
7.     //指定新建文件夹路径    
8.     NSString *imageDocPath = [documentPath stringByAppendingPathComponent:@"ImageFile"];    
9.     //创建ImageFile文件夹    
10.     [[NSFileManager defaultManager] createDirectoryAtPath:imageDocPath withIntermediateDirectories:YES attributes:nil error:nil];    
11.     //保存图片的路径   
12.     self.imagePath = [imageDocPath stringByAppendingPathComponent:@"image.png"];  
13.      
14. }  
15.   
16. -(void)viewWillAppear:(BOOL)animated{  
17.     [super viewWillAppear:YES];  
18.     //根据图片路径载入图片  
19.     UIImage *image=[UIImage imageWithContentsOfFile:self.imagePath];  
20.     if (image == nil) {  
21.         //显示默认  
22.         [changeImg setBackgroundImage:[UIImage imageNamed:@"[e-mail]"] forState:UIControlStateNormal];  
23.     }else {  
24.         //显示保存过的  
25.         [changeImg setBackgroundImage:image forState:UIControlStateNormal];  
26.     }  
27. }  
28.   
29. - (void)dealloc {  
30.     [imagePath release];  
31.     [changeImg release];  
32.     [super dealloc];  
33. }  
34. - (IBAction)changeImage:(id)sender {  
35.     UIActionSheet *myActionSheet = [[UIActionSheet alloc]                      
36.                                     initWithTitle:nil  
37.                                     delegate:self  
38.                                     cancelButtonTitle:@"取消"  
39.                                     destructiveButtonTitle:nil  
40.                                     otherButtonTitles: @"从相册选择", @"拍照",nil];   
41.     [myActionSheet showInView:self.view];  
42.     [myActionSheet release];   
43. }  
44. -(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{  
45.     switch (buttonIndex) {  
46.         case 0:  
47.             //从相册选择  
48.             [self LocalPhoto];  
49.             break;  
50.         case 1:  
51.             //拍照  
52.             [self takePhoto];  
53.             break;  
54.         default:  
55.             break;  
56.     }  
57. }  
58. //从相册选择  
59. -(void)LocalPhoto{  
60.     UIImagePickerController *picker = [[UIImagePickerController alloc] init];    
61.     //资源类型为图片库  
62.     picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;  
63.     picker.delegate = self;  
64.     //设置选择后的图片可被编辑  
65.     picker.allowsEditing = YES;  
66.     [self presentModalViewController:picker animated:YES];  
67.     [picker release];  
68. }  
69.   
70. //拍照  
71. -(void)takePhoto{  
72.     //资源类型为照相机  
73.     UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;  
74.     //判断是否有相机  
75.     if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]){  
76.         UIImagePickerController *picker = [[UIImagePickerController alloc] init];  
77.         picker.delegate = self;  
78.         //设置拍照后的图片可被编辑  
79.         picker.allowsEditing = YES;  
80.         //资源类型为照相机  
81.         picker.sourceType = sourceType;  
82.         [self presentModalViewController:picker animated:YES];  
83.         [picker release];  
84.     }else {  
85.         NSLog(@"该设备无摄像头");  
86.     }  
87. }  
88. #pragma Delegate method UIImagePickerControllerDelegate    
89. //图像选取器的委托方法，选完图片后回调该方法    
90. -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo{  
91.       
92.     //当图片不为空时显示图片并保存图片  
93.     if (image != nil) {    
94.         //图片显示在界面上  
95.         [changeImg setBackgroundImage:image forState:UIControlStateNormal];  
96.           
97.         //以下是保存文件到沙盒路径下  
98.         //把图片转成NSData类型的数据来保存文件  
99.         NSData *data;  
100.         //判断图片是不是png格式的文件  
101.         if (UIImagePNGRepresentation(image)) {  
102.             //返回为png图像。  
103.             data = UIImagePNGRepresentation(image);  
104.         }else {  
105.             //返回为JPEG图像。  
106.             data = UIImageJPEGRepresentation(image, 1.0);  
107.         }  
108.         //保存  
109.         [[NSFileManager defaultManager] createFileAtPath:self.imagePath contents:data attributes:nil];  
110.           
111.     }    
112.     //关闭相册界面  
113.     [picker dismissModalViewControllerAnimated:YES];  
114. }