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<a target=_blank target="_blank" title="与协议相关的所有文章" class="c_tag" href="/tag/%E5%8D%8F%E8%AE%AE" style="color: rgb(51, 102, 153); text-decoration: none;">协议</a>：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 stringBy<a target=_blank target="_blank" title="与app相关的所有文章" class="c_tag" href="/tag/app" style="color: rgb(51, 102, 153); text-decoration: none;">app</a>endingPathComponent:@"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)]; [UIImageJPE<a target=_blank target="_blank" title="与grep相关的所有文章" class="c_tag" href="/tag/grep" style="color: rgb(51, 102, 153); text-decoration: none;">grep</a>resentation(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;

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