ios - TextView字体大小根据设备屏幕自动调整

我限制字符的数量取决于textview的大小。我只允许2行，宽度根据设备而异。如何在不进行硬编码的情况下根据设备自动调整字体？

func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {

    // Combine the new text with the old
    let combinedText = (textView.text as NSString).stringByReplacingCharactersInRange(range, withString: text)

    // Create attributed version of the text
    let attributedText = NSMutableAttributedString(string: combinedText)
    attributedText.addAttribute(NSFontAttributeName, value: textView.font!, range: NSMakeRange(0, attributedText.length))

    // Get the padding of the text container
    let padding = textView.textContainer.lineFragmentPadding

    // Create a bounding rect size by subtracting the padding
    // from both sides and allowing for unlimited length
    let boundingSize = CGSizeMake(textView.frame.size.width - padding * 2, CGFloat.max)

    // Get the bounding rect of the attributed text in the
    // given frame
    let boundingRect = attributedText.boundingRectWithSize(boundingSize, options: NSStringDrawingOptions.UsesLineFragmentOrigin, context: nil)

    // Compare the boundingRect plus the top and bottom padding
    // to the text view height; if the new bounding height would be
    // less than or equal to the text view height, append the text
    if (boundingRect.size.height + padding * 1 <= textView.frame.size.height){
        return true
    }
    else {
        return false
    }

上面的我的代码根据文本视图的宽度来限制字符的数量，但是当在iphone 6上显示从4s写入的文本时，文本会被截断，因为iphone 4s的宽度小于iphone 6

最佳答案

您可以使用类似：

let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height

获取设备屏幕尺寸

关于ios - TextView字体大小根据设备屏幕自动调整，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32699229/