iOS實現頭像選取（照相或者圖片庫）、大小等比縮放、產生圓形頭像

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//彈出actionsheet。選擇擷取頭像的方式



//從相簿擷取圖片-(void)takePictureClick:(UIButton *)sender{//    /*註：使用，需要實現以下協議：UIImagePickerControllerDelegate,//     UINavigationControllerDelegate//     *///    UIImagePickerController *picker = [[UIImagePickerController alloc]init];//    //設定圖片源(相簿)//    picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;//    //設定代理//    picker.delegate = self;//    //設定可以編輯//    picker.allowsEditing = YES;//    //開啟拾取器介面//    [self presentViewController:picker animated:YES completion:nil];    UIActionSheet* actionSheet = [[UIActionSheet alloc]                                  initWithTitle:@"請選擇檔案來源"                                  delegate:self                                  cancelButtonTitle:@"取消"                                  destructiveButtonTitle:nil                                  otherButtonTitles:@"照相機",@"攝像機",@"本地相簿",@"本地視頻",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://照相機        {            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://攝像機        {            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://本地視頻        {            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(@"儲存頭像！");    //    [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)];//將圖片尺寸改為80*80    UIImage *smallImage = [self thumbnailWithImageWithoutScale:image size:CGSizeMake(93, 93)];    [UIImageJPEGRepresentation(smallImage, 1.0f) writeToFile:imageFilePath atomically:YES];//寫入檔案    UIImage *selfPhoto = [UIImage imageWithContentsOfFile:imageFilePath];//讀取圖片檔案//    [userPhotoButton setImage:selfPhoto forState:UIControlStateNormal];    self.img.image = selfPhoto;}// 改變映像的尺寸，方便上傳伺服器- (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.保持原始圖片的長寬比，產生需要尺寸的圖片

//2.保持原來的長寬比，產生一個縮圖- (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.顯示圓形頭像

    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];  //修改半徑，實現頭像的圓形化    self.img.layer.masksToBounds = YES;

 

希望能對大家有協助，如果你有更好的實現方式。歡迎告訴我。