iOS UIPickerController 调用相机，选择图片上传，带预览功能

在.h中加入delegate

@interface ViewController : UIViewController<UIActionSheetDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate>

//实现按钮事件

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-(IBAction)chooseImage:(id)sender {            UIActionSheet *sheet; <p> // 判断是否支持相机 </p> if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])           {            sheet  = [[UIActionSheet alloc] initWithTitle:@"选择" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"拍照",@"从相册选择", nil];           }        else {                    sheet = [[UIActionSheet alloc] initWithTitle:@"选择" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"从相册选择", nil];        }            sheet.tag = 255;            [sheet showInView:self.view];        }

 

实现actionSheet delegate 事件

判断是否支持相机,跳转到相机或相册界面

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-(void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {     if (actionSheet.tag == 255) {                    NSUInteger sourceType = 0;                    // 判断是否支持相机         if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {                            switch (buttonIndex) {                 case 0:                     // 取消                     return;                 case 1:                     // 相机                     sourceType = UIImagePickerControllerSourceTypeCamera;                     break;                                        case 2:                     // 相册                     sourceType = UIImagePickerControllerSourceTypePhotoLibrary;                     break;             }         }         else {             if (buttonIndex == 0) {                                    return;             } else {                 sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;             }         } <p> // 跳转到相机或相册页面 </p> UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];                    imagePickerController.delegate = self;                    imagePickerController.allowsEditing = YES;                    imagePickerController.sourceType = sourceType;                    [self presentViewController:imagePickerController animated:YES completion:^{}];                    [imagePickerController release];     } }

 

实现ImagePicker] delegate 事件

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- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {     [picker dismissViewControllerAnimated:YES completion:^{}];            UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];     /* 此处info 有六个值      * UIImagePickerControllerMediaType; // an NSString UTTypeImage)      * UIImagePickerControllerOriginalImage;  // a UIImage 原始图片      * UIImagePickerControllerEditedImage;    // a UIImage 裁剪后图片      * UIImagePickerControllerCropRect;       // an NSValue (CGRect)      * UIImagePickerControllerMediaURL;       // an NSURL        * UIImagePickerControllerReferenceURL    // an NSURL that references an asset in the AssetsLibrary framework      * UIImagePickerControllerMediaMetadata    // an NSDictionary containing metadata from a captured photo      */     // 保存图片至本地，方法见下文     [self saveImage:image withName:@"currentImage.png"];            NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"currentImage.png"];            UIImage *savedImage = [[UIImage alloc] initWithContentsOfFile:fullPath];            isFullScreen = NO;     [self.imageView setImage:savedImage];            self.imageView.tag = 100;        } - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {     [self dismissViewControllerAnimated:YES completion:^{}]; }

 保存图片方法

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#pragma mark - 保存图片至沙盒 - (void) saveImage:(UIImage *)currentImage withName:(NSString *)imageName {            NSData *imageData = UIImageJPEGRepresentation(currentImage, 0.5);     // 获取沙盒目录            NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:imageName];     // 将图片写入文件            [imageData writeToFile:fullPath atomically:NO]; }

 

实现点击图片预览功能,滑动放大缩小,带动画

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-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {            isFullScreen = !isFullScreen;     UITouch *touch = [touches anyObject];            CGPoint touchPoint = [touch locationInView:self.view];            CGPoint imagePoint = self.imageView.frame.origin;     //touchPoint.x ，touchPoint.y 就是触点的坐标            // 触点在imageView内，点击imageView时 放大,再次点击时缩小     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)     {         // 设置图片放大动画         [UIView beginAnimations:nil context:nil];         // 动画时间         [UIView setAnimationDuration:1];                    if (isFullScreen) {             // 放大尺寸                            self.imageView.frame = CGRectMake(0, 0, 320, 480);         }         else {             // 缩小尺寸             self.imageView.frame = CGRectMake(50, 65, 90, 115);         }                    // commit动画         [UIView commitAnimations];                }        }