Question

我正在尝试以编程方式创建符合其内容的UILabel。我能做的最好的事情是使用NSString's方法sizeWithAtributes来获取内容所需的宽度，然后应用一个约束来将宽度固定为该值。

这是应该使用autolayout完成的吗？

Answer 1

首先阅读any question about UILabel

的最佳答案

通过使用以下代码，您可以创建动态大小UILabel

UILabel *myLabelName = [[UILabel alloc] init];
myLabelName.backgroundColor = [UIColor redColor];
[myLabelName  setFont: [UIFont fontWithName:@"OpenSans" size:13]]; // set font and it's size as per your requirement.
myLabelName.textAlignment = NSTextAlignmentLeft;
myLabelName.frame = CGRectMake(lblComplainTitle.frame.origin.x + lblComplainTitle.frame.size.width + 7, lblComplainTitle.frame.origin.y +2, 160, 20);
myLabelName.text = @"This is my testing text, This is my testing text, This is my testing text, This is my testing text, This is my testing text, This is my testing text, This is my testing text, This is my testing text, This is my testing text, This is my testing text.";
myLabelName.textColor = [UIColor blackColor];
[self setDynamicHeightOfLabel:myLabelName withLblWidth:160 andFontSize:13]; // here in this function you need to pass object of label with width (as you wabt) and font size
[self.view addSubview:myLabelName];

功能代码，名称为setDynamicHeightOfLabel:withLblWidth:andFontSize

-(void) setDynamicHeightOfLabel:(UILabel *) myLabel withLblWidth:(CGFloat) width andFontSize:(int) fontSize
{
    CGSize myLabelSize = CGSizeMake(width, FLT_MAX);
    CGSize expecteingmyLabelSize = [myLabel.text sizeWithFont:myLabel.font constrainedToSize:myLabelSize lineBreakMode:myLabel.lineBreakMode];
    CGRect lblFrame = myLabel.frame;
    lblFrame.size.height = expecteingmyLabelSize.height;
    myLabel.frame = lblFrame;
    int addressLine = myLabel.frame.size.height/fontSize;
    myLabel.numberOfLines = addressLine;
}

我创建功能，因为您可以使用动态尺寸创建任何标签，而无需使用重复的代码。

Answer 2

如果您需要一些自动布局，我会尝试评论：

    UILabel *testLabel = [UILabel new];
    [testLabel setFont:[UIFont systemFontOfSize:16]];
    [testLabel setText:@"Test text for size context"];
    [testLabel setTextAlignment:NSTextAlignmentLeft];
    [testLabel setNumberOfLines:0]; //0 - infiniy lines if not enough space more
    [testLabel setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal]; // Autolayout rule: The higher the priority, the more important hold the text.. by horizontal
    [testLabel setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisVertical];//some like above but verticale
    [testLabel setContentCompressionResistancePriority:UILayoutPriorityDefaultLow forAxis:UILayoutConstraintAxisHorizontal];// reverse like Hugging but Compression. then lower priority then text croping.
    [testLabel setContentCompressionResistancePriority:UILayoutPriorityDefaultLow forAxis:UILayoutConstraintAxisVertical];
    [testLabel preferredMaxLayoutWidth:200];//Start new line each 200 points width
    [testLabel setPreferredMaxLayoutWidth:YES];// resize Font size by label size.
    [testLabel setTranslatesAutoresizingMaskIntoConstraints:NO]; // Disable autolaresize, enable autolayouts

Answer 3

要使用autolayout实现此目的，您需要执行几个步骤。

设置标签的布局约束。
以低优先级设置height约束。
将numberOfLines设置为0以允许多行文字。
为标签设置preferredMaxLayoutWidth。

标签使用preferredMaxLayoutWidth来计算其高度。

此属性会影响布局约束时标签的大小适用于它。在布局期间，如果文本超出宽度由此属性指定，附加文本将流向一个或更多新线，从而增加标签的高度。

Answer 4

您可以通过编程方式管理标签的宽度，

CGRect frame;

frame =self.yourLabel.frame;
frame.size.width +=20;
self.yourLabel.frame=frame;

由于

以编程方式创建UILabel的宽度

4 个答案: