如何根据文本调整标签宽度?如果文本长度较短,我希望标签宽度也小...如果文本长度较长,我希望标签宽度与文本长度相同。这是否有可能?
实际上,我有两个UIlabel。我需要将它们放在附近。但是如果第一个标签的文本太小,就会有很大的间隙。我想要消除这个间隙。
如何根据文本调整标签宽度?如果文本长度较短,我希望标签宽度也小...如果文本长度较长,我希望标签宽度与文本长度相同。这是否有可能?
实际上,我有两个UIlabel。我需要将它们放在附近。但是如果第一个标签的文本太小,就会有很大的间隙。我想要消除这个间隙。
//use this for custom font
CGFloat width = [label.text sizeWithFont:[UIFont fontWithName:@"ChaparralPro-Bold" size:40 ]].width;
//use this for system font
CGFloat width = [label.text sizeWithFont:[UIFont systemFontOfSize:40 ]].width;
label.frame = CGRectMake(point.x, point.y, width,height);
//point.x, point.y -> origin for label;
//height -> your label height;
sizeWithFont:
函数在iOS 7.0中已经被弃用,因此你必须使用sizeWithAttributes:
函数来支持iOS 7.0+。同时为了支持老版本,可以使用以下代码:
CGFloat width;
if ([[UIDevice currentDevice].systemVersion floatValue] < 7.0)
{
width = [text sizeWithFont:[UIFont fontWithName:@"Helvetica" size:16.0 ]].width;
}
else
{
width = ceil([text sizeWithAttributes:@{NSFontAttributeName: [UIFont fontWithName:@"Helvetica" size:16.0]}].width);
}
根据苹果文档建议,对 sizeWithAttributes:
方法的结果使用 ceil()
函数:
“此方法返回带小数的大小;为了将所返回的大小用于调整视图大小,必须使用 ceil 函数将其值提高到最接近的整数。”
// In swift 2.0
let lblDescription = UILabel(frame: CGRectMake(0, 0, 200, 20))
lblDescription.numberOfLines = 0
lblDescription.text = "Sample text to show its whatever may be"
lblDescription.sizeToFit()
// Its automatically Adjust the height
UIFont *myFont = [UIFont boldSystemFontOfSize:15.0];
// Get the width of a string ...
CGSize size = [@"Some string here" sizeWithFont:myFont];
// Get the width of a string when wrapping within a particular width
NSString *mystring = @"some strings some string some strings...";
CGSize size = [mystring sizeWithFont:myFont
forWidth:150.0
lineBreakMode:UILineBreakModeWordWrap];
[label sizeToFit];
方法。使用此方法,您可以将两个标签的框架设置为:[firstLabel sizeToFit];
[secondLabel sizeToFit];
secondLabel.frame = CGRectMake(CGRectGetMaxX(firstLabel.frame), secondLabel.origin.y, secondLabel.frame.size.width, secondLabel.frame.size.height);
sizeWithFont constrainedToSize:lineBreakMode:
是原始的方法。以下是如何使用它的示例:
//Calculate the expected size based on the font and linebreak mode of your label
CGSize maximumLabelSize = CGSizeMake(296,9999);
CGSize expectedLabelSize = [yourString sizeWithFont:yourLabel.font constrainedToSize:maximumLabelSize lineBreakMode:yourLabel.lineBreakMode];
//adjust the label the the new height.
CGRect newFrame = yourLabel.frame;
newFrame.size.height = expectedLabelSize.height;
yourLabel.frame = newFrame;
如果您在视图、XIB或单元格中使用约束,请使用“to”关键字。
[LBl sizeToFit];
dispatch_async(dispatch_get_main_queue(), ^{
[LBl sizeToFit];
});
/* Consider these two labels as the labels that you use,
and that these labels have been initialized */
UILabel* firstLabel;
UILabel* secondLabel;
CGSize labelSize = [firstLabel.text sizeWithFont:[UIFont systemFontOfSize:12]];
//change the font size, or font as per your requirements
CGRect firstLabelRect = firstLabel.frame;
firstLabelRect.size.width = labelSize.width;
//You will get the width as per the text in label
firstLabel.frame = firstLabelRect;
/* Now, let's change the frame for the second label */
CGRect secondLabelRect;
CGFloat x = firstLabelRect.origin.x;
CGFloat y = firstLabelRect.origin.y;
x = x + labelSize.width + 20; //There are some changes here.
secondLabelRect = secondLabel.frame;
secondLabelRect.origin.x = x;
secondLabelRect.origin.y = y;
secondLabel.frame = secondLabelRect;