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
7.     if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
9.        {
10.            sheet  = [[UIActionSheet alloc] initWithTitle:@"选择" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"拍照",@"从相册选择", nil];
12.        }
14.     else {
15.         
16.         sheet = [[UIActionSheet alloc] initWithTitle:@"选择" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"从相册选择", nil];
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];
3. NSString *Path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"currentImage.png"];
4.               
5. [requestReport setFile:Path forKey:@"picturepath"];
7. [requestReport buildPostBody];
9. requestReport.delegate = self;
11. [requestReport startAsynchronous];

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