iOS调用相机,相册,上传头像

一、新建工程  

二、拖控件，创建映射 

三、在.h中加入delegate

1. @interface ViewController : UIViewController

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四、实现按钮事件 

1. -(IBAction)chooseImage:(id)sender {
   
2.     
   
3.     UIActionSheet *sheet;
   
4.     
   
5.     // 判断是否支持相机
   
6. 
   
7.     if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
   
8. 
   
9.        {
   
10.            sheet  = [[UIActionSheet alloc] initWithTitle:@"选择" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"拍照",@"从相册选择", nil];
    
11. 
    
12.        }
    
13. 
    
14.     else {
    
15.         
    
16.         sheet = [[UIActionSheet alloc] initWithTitle:@"选择" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"从相册选择", nil];
    
17. 
    
18.     }
    
19.     
    
20.     sheet.tag = 255;
    
21.     
    
22.     [sheet showInView:self.view];
    
23.     
    
24. }

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五、实现actionSheet delegate事件

1. -(void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
   
2. {
   
3.     if (actionSheet.tag == 255) {
   
4.         
   
5.         NSUInteger sourceType = 0;
   
6.         
   
7.         // 判断是否支持相机
   
8.         if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
   
9.             
   
10.             switch (buttonIndex) {
    
11.                 case 0:
    
12.                     // 取消
    
13.                     return;
    
14.                 case 1:
    
15.                     // 相机
    
16.                     sourceType = UIImagePickerControllerSourceTypeCamera;
    
17.                     break;
    
18.                     
    
19.                 case 2:
    
20.                     // 相册
    
21.                     sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    
22.                     break;
    
23.             }
    
24.         }
    
25.         else {
    
26.             if (buttonIndex == 0) {
    
27.                 
    
28.                 return;
    
29.             } else {
    
30.                 sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    
31.             }
    
32.         }
    
33.         // 跳转到相机或相册页面
    
34.         UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
    
35.         
    
36.         imagePickerController.delegate = self;
    
37.         
    
38.         imagePickerController.allowsEditing = YES;
    
39.         
    
40.         imagePickerController.sourceType = sourceType;
    
41.         
    
42.         [self presentViewController:imagePickerController animated:YES completion:^{}];
    
43.         
    
44.         [imagePickerController release];
    
45.     }
    
46. }

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六、实现ImagePicker delegate 事件

1. #pragma mark - image picker delegte
   
2. - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
   
3. {
   
4.     [picker dismissViewControllerAnimated:YES completion:^{}];
   
5.     
   
6.     UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
   
7.     /* 此处info 有六个值 
   
8.      * UIImagePickerControllerMediaType; // an NSString UTTypeImage)
   
9.      * UIImagePickerControllerOriginalImage;  // a UIImage 原始图片
   
10.      * UIImagePickerControllerEditedImage;    // a UIImage 裁剪后图片
    
11.      * UIImagePickerControllerCropRect;       // an NSValue (CGRect)
    
12.      * UIImagePickerControllerMediaURL;       // an NSURL   
    
13.      * UIImagePickerControllerReferenceURL    // an NSURL that references an asset in the AssetsLibrary framework
    
14.      * UIImagePickerControllerMediaMetadata    // an NSDictionary containing metadata from a captured photo
    
15.      */
    
16.     // 保存图片至本地，方法见下文
    
17.     [self saveImage:image withName:@"currentImage.png"];
    
18.     
    
19.     NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"currentImage.png"];
    
20.     
    
21.     UIImage *savedImage = [[UIImage alloc] initWithContentsOfFile:fullPath];
    
22.     
    
23.     isFullScreen = NO;
    
24.     [self.imageView setImage:savedImage];
    
25.     
    
26.     self.imageView.tag = 100;
    
27.     
    
28. }
    
29. - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
    
30. {
    
31.         [self dismissViewControllerAnimated:YES completion:^{}];
    
32. }

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七、保存图片
高保真压缩图片方法

1. NSData * UIImageJPEGRepresentation ( UIImage *image, CGFloat compressionQuality
   
2. )

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此方法可将图片压缩，但是图片质量基本不变，第二个参数即图片质量参数。

1. #pragma mark - 保存图片至沙盒
   
2. - (void) saveImage:(UIImage *)currentImage withName:(NSString *)imageName
   
3. {
   
4.     
   
5.     NSData *imageData = UIImageJPEGRepresentation(currentImage, 0.5);
   
6.     // 获取沙盒目录
   
7.     
   
8.     NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:imageName];
   
9.     // 将图片写入文件
   
10.     
    
11.     [imageData writeToFile:fullPath atomically:NO];
    
12. }

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八、实现点击图片预览功能，滑动放大缩小，带动画 

1. -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
   
2. {
   
3.     
   
4.     isFullScreen = !isFullScreen;
   
5.     UITouch *touch = [touches anyObject];
   
6.     
   
7.     CGPoint touchPoint = [touch locationInView:self.view];
   
8.     
   
9.     CGPoint imagePoint = self.imageView.frame.origin;
   
10.     //touchPoint.x ，touchPoint.y 就是触点的坐标
    
11.     
    
12.     // 触点在imageView内，点击imageView时 放大,再次点击时缩小
    
13.     if(imagePoint.x <= touchPoint.x && imagePoint.x +self.imageView.frame.size.width >=touchPoint.x && imagePoint.y <=  touchPoint.y && imagePoint.y+self.imageView.frame.size.height >= touchPoint.y)
    
14.     {
    
15.         // 设置图片放大动画
    
16.         [UIView beginAnimations:nil context:nil];
    
17.         // 动画时间
    
18.         [UIView setAnimationDuration:1];
    
19.         
    
20.         if (isFullScreen) {
    
21.             // 放大尺寸
    
22.             
    
23.             self.imageView.frame = CGRectMake(0, 0, 320, 480);
    
24.         }
    
25.         else {
    
26.             // 缩小尺寸
    
27.             self.imageView.frame = CGRectMake(50, 65, 90, 115);
    
28.         }
    
29.         
    
30.         // commit动画
    
31.         [UIView commitAnimations];
    
32.         
    
33.     }
    
34.     
    
35. }

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九、上传图片，使用ASIhttpRequest类库实现，由于本文重点不是网络请求，故不对ASIHttpRequest详细讲述，只贴出部分代码

1. ASIFormDataRequest *requestReport  = [[ASIFormDataRequest alloc] initWithURL:服务器地址];
   
2. 
   
3. NSString *Path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"currentImage.png"];
   
4.               
   
5. [requestReport setFile:Path forKey:@"picturepath"];
   
6. 
   
7. [requestReport buildPostBody];
   
8. 
   
9. requestReport.delegate = self;
   
10. 
    
11. [requestReport startAsynchronous];

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