计算UILabel的高度？

Question

我想知道是否可以获得多线的高度UILabel？我正在开发一个消息传递应用程序，并希望实现类似iPhone消息传递应用程序。

Answer 1

您可以label.frame.size.height

Answer 2

如果你打电话

[label sizeToFit]; 

将调整的UILabel来容纳所有内容所需的最小尺寸。然后，您可以仅使用label.frame.size.height来获取包含该文本数量的标签的高度。

Answer 3

你可能想的-[UILabel sizeThatFits:]方法获得的财产。这就是你所做的。假设您的UILabel位于变量myLabel中，并且您已将其宽度设置为任何您想要的值。

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) };