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

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; }
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

 

2.保持原始图片的长宽比,生成需要尺寸的图片

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
//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;
}
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

 

 

3.显示圆形头像

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
    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;
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

 

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。

 

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,布布扣,bubuko.com

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

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