iOS 调用系统相机和相册

一,创建button,触发点击事件,调用系统相机/相册选取头像

- (IBAction)chooseUserPicAction:(id)sender {        UIActionSheet *sheet;            // 判断是否支持相机        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];}

二,遵循协议

<UIActionSheetDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate>

三,实现actionSheet delegate事件

-(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;            }        }                // 跳转到相机或相册页面        UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];                imagePickerController.delegate = self;                imagePickerController.allowsEditing = YES;                imagePickerController.sourceType = sourceType;        //        //iphone使用此方法进行跳转//        [self presentViewController:imagePickerController animated:YES completion:^{}];               //ipad需要使用此方法进行跳转        [[NSOperationQueue mainQueue] addOperationWithBlock:^{            // Place image picker on the screen            [self presentViewController:imagePickerController animated:YES completion:nil];        }];      }}

四,image picker delegte

- (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.userPicImageView setImage:savedImage];        self.userPicImageView.tag = 100;    }- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{    [self dismissViewControllerAnimated:YES completion:^{}];}

五,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];}

六,实现点击图片预览功能，滑动放大缩小，带动画 

-(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];            }    }

七,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

ASIFormDataRequest *requestReport  = [[ASIFormDataRequest alloc] initWithURL:服务器地址]; NSString *Path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"currentImage.png"];              [requestReport setFile:Path forKey:@"picturepath"];[requestReport buildPostBody];requestReport.delegate = self;[requestReport startAsynchronous];