在視圖中繪製大圖像

Question

我想繪製尺寸大於視圖框架的圖像，並保留原始圖像的大小和質量。

我嘗試繪製視圖框架，但它失去了質量。

UIGraphicsBeginImageContext(self.imageViewDrawing.frame.size); 
    [self.imageViewDrawing.image drawInRect:CGRectMake(0, 0, self.imageViewDrawing.frame.size.width, self.imageViewDrawing.frame.size.height)]; 

SS：http://www.imagebam.com/image/215dd5285081681

我嘗試用圖像的尺寸繪製，但它只是在圖像繪製背景框尺寸繪製。

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

SS：http://www.imagebam.com/image/682962285081678

UIGraphicsBeginImageContext(self.imageViewDrawing.frame.size); 
    [self.imageViewDrawing.image drawInRect:CGRectMake(0, 0, self.imageViewDrawing.image.size.width, self.imageViewDrawing.image.size.height)]; 

SS：http://www.imagebam.com/image/f80341285082782

Answer 1

一個好的解決辦法是使用這裏的UIIMage+Resize類別提出：http://vocaro.com/trevor/blog/2009/10/12/resize-a-uiimage-the-right-way/

它運作良好，並保持質量圖片