Question

当我设置一个包含大量内容的UILabel时遇到问题，例如20,000个单词。我用这种方法计算UILabel的大小：

 CGSize labelSize = [myLabel.text sizeWithFont:myLabel.text.font 
                                                            constrainedToSize:CGSizeMake(400, CGFLOAT_MAX) 
                                                                lineBreakMode:UILineBreakModeWordWrap];

显示标签时总会崩溃。

我不知道为什么，但我用UITextView替换它并解决了问题。

有谁知道这个的原因吗？谢谢！

Answer 1

float desiredHeight = 50.0;
NSString *yourText = @\"This is some\nmultiline text\nthat you want to fit in your frame.\";
CGRect frame = CGRectMake(30.0, 30.0, 250.0, desiredHeight);
int originalFontSize = 30; // let's say
UILabel *label = [[UILabel alloc] initWithFrame:frame];
label.font = [UIFont boldSystemFontOfSize:originalFontSize];

frame.size.height = 3000.0; // just make sure it's big enough
CGSize result = [yourText sizeWithFont:label.font constrainedToSize:frame.size lineBreakMode:UILineBreakModeWordWrap];
int newFontSize = (desiredHeight / result.height) * (float)originalFontSize;
label.font = [UIFont boldSystemFontOfSize:newFontSize];
label.numberOfLines = 0;

label.text = yourText;

[self.view addSubview:label];

试试这个并调整字体。还调整行号。它可以纠正我希望的问题

Answer 2

也许最好做这样的事情：

UILabel *label = [[UILabel alloc] initWithFrame: CGRectMake(0.0, 0.0, self.view.frame.size.width, 0.0)];
[label setText: @"your text"];
[label sizeToFit];

CGRect labelFrame = label.frame;
labelFrame.size.height = label.contentSize.height;
label.frame            = labelFrame;

[self.view addSubview: label];

现在您可以添加文字，其高度将按xcode计算

uilabel在拥有大量文本内容时崩溃

2 个答案: