iOS实现头像选取（照相或者图片库）、大小等比缩放、生成圆形头像

//弹出actionsheet。选择获取头像的方式



//从相册获取图片

-(void)takePictureClick:(UIButton *)sender

{

//    /*注：使用，需要实现以下协议：UIImagePickerControllerDelegate,

//     UINavigationControllerDelegate

//     */

//    UIImagePickerController *picker = [[UIImagePickerController alloc]init];

//    //设置图片源(相簿)

//    picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

//    //设置代理

//    picker.delegate = self;

//    //设置可以编辑

//    picker.allowsEditing = YES;

//    //打开拾取器界面

//    [self presentViewController:picker animated:YES completion:nil];

    UIActionSheet* actionSheet = [[UIActionSheet alloc]

                                  initWithTitle:@"请选择文件来源"

                                  delegate:self

                                  cancelButtonTitle:@"取消"

                                  destructiveButtonTitle:nil

                                  otherButtonTitles:@"照相机",@"摄像机",@"本地相簿",@"本地视频",nil];

    [actionSheet showInView:self.view];

    

}

#pragma mark -

#pragma UIActionSheet Delegate

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex

{

    NSLog(@"buttonIndex = [%d]",buttonIndex);

    switch (buttonIndex) {

        case 0://照相机

        {

            UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

            imagePicker.delegate = self;

            imagePicker.allowsEditing = YES;

            imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

//            [self presentModalViewController:imagePicker animated:YES];

            [self presentViewController:imagePicker animated:YES completion:nil];

        }

            break;

        case 1://摄像机

        {

            UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

            imagePicker.delegate = self;

            imagePicker.allowsEditing = YES;

            imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

            imagePicker.videoQuality = UIImagePickerControllerQualityTypeLow;

//            [self presentModalViewController:imagePicker animated:YES];

            [self presentViewController:imagePicker animated:YES completion:nil];

        }

            break;

        case 2://本地相簿

        {

            UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

            imagePicker.delegate = self;

            imagePicker.allowsEditing = YES;

            imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//            [self presentModalViewController:imagePicker animated:YES];

            [self presentViewController:imagePicker animated:YES completion:nil];

        }

            break;

        case 3://本地视频

        {

            UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

            imagePicker.delegate = self;

            imagePicker.allowsEditing = YES;

            imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//            [self presentModalViewController:imagePicker animated:YES];

            [self presentViewController:imagePicker animated:YES completion:nil];

        }

            break;

        default:

            break;

    }

}



#pragma mark -

#pragma UIImagePickerController Delegate

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{

    if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(__bridge NSString *)kUTTypeImage]) {

        UIImage *img = [info objectForKey:UIImagePickerControllerEditedImage];

        [self performSelector:@selector(saveImage:)  withObject:img afterDelay:0.5];

    }

    else if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(__bridge NSString *)kUTTypeMovie]) {

        NSString *videoPath = [[info objectForKey:UIImagePickerControllerMediaURL] path];

        self.fileData = [NSData dataWithContentsOfFile:videoPath];

    }

//    [picker dismissModalViewControllerAnimated:YES];

    [picker dismissViewControllerAnimated:YES completion:nil];

}



- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

{

//    [picker dismissModalViewControllerAnimated:YES];

        [picker dismissViewControllerAnimated:YES completion:nil];

}



- (void)saveImage:(UIImage *)image {

    //    NSLog(@"保存头像！");

    //    [userPhotoButton setImage:image forState:UIControlStateNormal];

    BOOL success;

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSError *error;

    

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *imageFilePath = [documentsDirectory stringByAppendingPathComponent:@"selfPhoto.jpg"];

    NSLog(@"imageFile->>%@",imageFilePath);

    success = [fileManager fileExistsAtPath:imageFilePath];

    if(success) {

        success = [fileManager removeItemAtPath:imageFilePath error:&error];

    }

//    UIImage *smallImage=[self scaleFromImage:image toSize:CGSizeMake(80.0f, 80.0f)];//将图片尺寸改为80*80

    UIImage *smallImage = [self thumbnailWithImageWithoutScale:image size:CGSizeMake(93, 93)];

    [UIImageJPEGRepresentation(smallImage, 1.0f) writeToFile:imageFilePath atomically:YES];//写入文件

    UIImage *selfPhoto = [UIImage imageWithContentsOfFile:imageFilePath];//读取图片文件

//    [userPhotoButton setImage:selfPhoto forState:UIControlStateNormal];

    self.img.image = selfPhoto;

}



// 改变图像的尺寸，方便上传服务器

- (UIImage *) scaleFromImage: (UIImage *) image toSize: (CGSize) size

{

    UIGraphicsBeginImageContext(size);

    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return newImage;

}

 

2.保持原始图片的长宽比，生成需要尺寸的图片

//2.保持原来的长宽比，生成一个缩略图

- (UIImage *)thumbnailWithImageWithoutScale:(UIImage *)image size:(CGSize)asize

{

    UIImage *newimage;

    if (nil == image) {

        newimage = nil;

    }

    else{

        CGSize oldsize = image.size;

        CGRect rect;

        if (asize.width/asize.height > oldsize.width/oldsize.height) {

            rect.size.width = asize.height*oldsize.width/oldsize.height;

            rect.size.height = asize.height;

            rect.origin.x = (asize.width - rect.size.width)/2;

            rect.origin.y = 0;

        }

        else{

            rect.size.width = asize.width;

            rect.size.height = asize.width*oldsize.height/oldsize.width;

            rect.origin.x = 0;

            rect.origin.y = (asize.height - rect.size.height)/2;

        }

        UIGraphicsBeginImageContext(asize);

        CGContextRef context = UIGraphicsGetCurrentContext();

        CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);

        UIRectFill(CGRectMake(0, 0, asize.width, asize.height));//clear background

        [image drawInRect:rect];

        newimage = UIGraphicsGetImageFromCurrentImageContext();

        UIGraphicsEndImageContext();

    }

    return newimage;

}

 

 

3.显示圆形头像

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *imageFilePath = [documentsDirectory stringByAppendingPathComponent:@"selfPhoto.jpg"];

    NSLog(@"imageFile->>%@",imageFilePath);

    UIImage *selfPhoto = [UIImage imageWithContentsOfFile:imageFilePath];//

    self.img.image = selfPhoto;

    [self.img.layer setCornerRadius:CGRectGetHeight([self.img bounds]) / 2];  //修改半径，实现头像的圆形化

    self.img.layer.masksToBounds = YES;

 

希望能对大家有帮助，如果你有更好的实现方式。欢迎告诉我。

 demo下载地址:http://download.csdn.net/detail/wangtao169447/7515487

https://github.com/wangtao169447/TakeAvatarPhoto