35

我知道这应该很简单,但是我一直在努力以编程方式创建 UILabel 并让它按照我想要的方式运行。

我想要的只是能够创建一个标签,将最大属性设置为高度、宽度和字体大小,然后让文本变小和/或截断文本以适应长字符串。

假设我希望我的标签具有最大宽度为 380、最大高度为 20、最大字体大小为 12 的文本。

所以这是我试图创建这样一个标签的方法:

UILabel *fromLabel = [[UILabel alloc]initWithFrame:CGRectMake(91, 15, 0, 0)];
fromLabel.text = [self fromSender];
fromLabel.font = [UIFont fontWithName:ProximaNovaSemibold size:12]; //custom font
fromLabel.numberOfLines = 1;
fromLabel.baselineAdjustment = YES;
fromLabel.adjustsFontSizeToFitWidth = YES;
fromLabel.adjustsLetterSpacingToFitWidth = YES;
fromLabel.size = [fromLabel.text sizeWithFont:fromLabel.font constrainedToSize:CGSizeMake(380, 20) lineBreakMode:NSLineBreakByTruncatingTail];
fromLabel.minimumScaleFactor = MIN_SCALE_FACTOR;
fromLabel.clipsToBounds = YES;
fromLabel.backgroundColor = [UIColor clearColor];
fromLabel.textColor = [UIColor blackColor];
fromLabel.textAlignment = NSTextAlignmentLeft;
[collapsedViewContainer addSubview:fromLabel];

好的,标签出现了,但是文本大于 12 并且高度总是 21!?即使我将高度和文本大小值更改为极端大小,此代码也会创建一个无法调整的固定大小的标签。我唯一能做的似乎是宽度变小了。

我一定是在看一些基本的东西,但我真的不知道如何得到我想要的结果,我也不明白为什么我会得到我正在得到的行为。

4

8 回答 8

57

以下工作吗?

UIFont * customFont = [UIFont fontWithName:ProximaNovaSemibold size:12]; //custom font
NSString * text = [self fromSender];

CGSize labelSize = [text sizeWithFont:customFont constrainedToSize:CGSizeMake(380, 20) lineBreakMode:NSLineBreakByTruncatingTail];

UILabel *fromLabel = [[UILabel alloc]initWithFrame:CGRectMake(91, 15, labelSize.width, labelSize.height)];
fromLabel.text = text;
fromLabel.font = customFont;
fromLabel.numberOfLines = 1;
fromLabel.baselineAdjustment = UIBaselineAdjustmentAlignBaselines; // or UIBaselineAdjustmentAlignCenters, or UIBaselineAdjustmentNone
fromLabel.adjustsFontSizeToFitWidth = YES;
fromLabel.adjustsLetterSpacingToFitWidth = YES;
fromLabel.minimumScaleFactor = 10.0f/12.0f;
fromLabel.clipsToBounds = YES;
fromLabel.backgroundColor = [UIColor clearColor];
fromLabel.textColor = [UIColor blackColor];
fromLabel.textAlignment = NSTextAlignmentLeft;
[collapsedViewContainer addSubview:fromLabel];

编辑:我相信你可能会遇到同时使用adjustsFontSizeToFitWidth和的问题minimumScaleFactor。前者声明您还需要设置 a minimumFontWidth(否则根据我的测试,它可能会缩小到完全不可读的东西),但这已被弃用并被后者取代。

编辑 2:没关系,过时的文档。adjustsFontSizeToFitWidth需要minimumScaleFactor,只要确保不将其 0 作为 minimumScaleFactor 传递(整数除法,10/12 返回 0)。值的变化也很小baselineAdjustment

于 2013-07-23T14:49:17.230 回答
15
UILabel *lbl1 = [[UILabel alloc] init];
/*important--------- */lbl1.textColor = [UIColor blackColor];
[lbl1 setFrame:position];
lbl1.backgroundColor=[UIColor clearColor];
lbl1.textColor=[UIColor whiteColor];
lbl1.userInteractionEnabled=NO;
lbl1.text= @"TEST";
[self.view addSubview:lbl1];
于 2013-12-20T16:36:03.087 回答
7

这是如何以编程方式创建 UILabel ..

1)将其写入项目的 .h 文件中。

UILabel *label;

2)将其写入项目的 .m 文件中。

label=[[UILabel alloc]initWithFrame:CGRectMake(10, 70, 50, 50)];//Set frame of label in your viewcontroller.
[label setBackgroundColor:[UIColor lightGrayColor]];//Set background color of label.
[label setText:@"Label"];//Set text in label.
[label setTextColor:[UIColor blackColor]];//Set text color in label.
[label setTextAlignment:NSTextAlignmentCenter];//Set text alignment in label.
[label setBaselineAdjustment:UIBaselineAdjustmentAlignBaselines];//Set line adjustment.
[label setLineBreakMode:NSLineBreakByCharWrapping];//Set linebreaking mode..
[label setNumberOfLines:1];//Set number of lines in label.
[label.layer setCornerRadius:25.0];//Set corner radius of label to change the shape.
[label.layer setBorderWidth:2.0f];//Set border width of label.
[label setClipsToBounds:YES];//Set its to YES for Corner radius to work.
[label.layer setBorderColor:[UIColor blackColor].CGColor];//Set Border color.
[self.view addSubview:label];//Add it to the view of your choice. 
于 2015-04-17T07:15:52.277 回答
3

斯威夫特 3:

let label = UILabel(frame: CGRect(x:0,y: 0,width: 250,height: 50))
label.textAlignment = .center
label.textColor = .white
label.font = UIFont(name: "Avenir-Light", size: 15.0)
label.text = "This is a Label"
self.view.addSubview(label)
于 2017-05-05T07:10:50.980 回答
2
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 30, 300, 50)];
label.backgroundColor = [UIColor clearColor];
label.textAlignment = NSTextAlignmentCenter;
label.textColor = [UIColor whiteColor];
label.numberOfLines = 0;
label.lineBreakMode = UILineBreakModeWordWrap;
label.text = @"Your Text";
[self.view addSubview:label];
于 2016-07-30T08:23:09.890 回答
1
In Swift -

var label:UILabel = UILabel(frame: CGRectMake(0, 0, 70, 20))
label.center = CGPointMake(50, 70)
label.textAlignment = NSTextAlignment.Center
label.text = "message"
label.textColor = UIColor.blackColor()
self.view.addSubview(label)
于 2016-07-30T08:26:21.597 回答
0

为了迅速

var label = UILabel(frame: CGRect(x: 0, y: 0, width: 250, height: 50))
label.textAlignment = .left
label.text = "This is a Label"
self.view.addSubview(label)
于 2016-06-15T09:50:39.177 回答
-1
UILabel *mycoollabel=[[UILabel alloc]initWithFrame:CGRectMake(10, 70, 50, 50)];
mycoollabel.text=@"I am cool";

// for multiple lines,if text lenght is long use next line
mycoollabel.numberOfLines=0;
[self.View addSubView:mycoollabel];
于 2015-12-01T11:04:40.767 回答