iOS---头像选取（照相或者图片库）、大小等比缩放、生成圆形头像

转载自:http://www.lvtao.net/ios/509.html

//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:selfcancelButtonTitle:@"取消"destructiveButtonTitle:nilotherButtonTitles:@"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*80UIImage *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;}

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;