計算UILabel的高度？

Question

我想知道是否可以獲得多線的高度UILabel？我正在開發一個消息傳遞應用程序，並希望實現類似iPhone消息傳遞應用程序。

Answer 1

您可以label.frame.size.height

Answer 2

如果你打電話

[label sizeToFit]; 

將調整的UILabel來容納所有內容所需的最小尺寸。然後，您可以僅使用label.frame.size.height來獲取包含該文本數量的標籤的高度。

Answer 3

你可能想的-[UILabel sizeThatFits:]方法獲得的財產。這就是你所做的。假設您的UILabel位於變量myLabel中，並且您已將其寬度設置爲任何您想要的值。

myLabel.text = @"This is my very long message which will probably need multiple lines to be displayed because it is very long."; 

CGRect bounds = myLabel.bounds; 

// Create a size that is the label's current width, and very very tall. 
CGSize prototypeSize = CGSizeMake(bounds.size.width, MAXFLOAT); 

// Ask myLabel how big it would be if it had to fit in prototypeSize. 
// It will figure out where it would put line breaks in the text to 
// fit prototypeSize.width. 
CGSize fittedSize = [myLabel sizeThatFits:prototypeSize]; 

// Now update myLabel.bounds using the fitted height and its existing width. 
myLabel.bounds = (CGRect){ bounds.origin, CGSizeMake(bounds.size.width, fittedSize.height) };