自定義UISilder的拇指

Question

我已經改變了UISlider的拇指image.But我不能改變圖像的大小

var image=UIImage(named: "thumb.png")        
    slider.setThumbImage(image, forState: UIControlState.Normal) 

我發現滑塊功能slider.thumbRectForBounds但它不幫我

Answer 1

嘗試了這一點

func imageWith(image : UIImage, scaledToSize:CGSize) -> UIImage { 
    UIGraphicsBeginImageContextWithOptions(scaledToSize, false, 0.0); 
    image.drawInRect(CGRectMake(0, 0, scaledToSize.width, scaledToSize.height)) 
    let newImage = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 
    return newImage; 
} 


var image = UIImage(named: "thumb.png") 
slider.setThumbImage(imageWith(image, scaledToSize: <YOUR_SIZE>), forState: UIControlState.Normal)