以编程方式创建UILabel [英] Programmatically Creating UILabel

问题描述

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并使它以我想要的方式工作.

I know this should be very simple, but I've been really struggling with creating a UILabel programmatically and getting it to behave the way I would like.

我想要做的就是能够创建标签，设置最大属性，包括高度，宽度和字体大小，然后使文本变小和/或仅截断文本以容纳较长的字符串.

All I want is to be able to create a label, set the maximum attributes as far as height, width and font size, and then have the text get smaller AND/OR just truncate the text to accommodate long strings of text.

假设我希望标签上的文字最大宽度为380，最大高度为20，最大字体为12.

Let's say that I want my label to have text that has a maximum width of 380, a maximum height of 20 and a maximum font size of 12.

这就是我试图创建这样的标签的步骤:

So here is what I have attempted to do to create such a label:

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];

好吧，所以出现了标签，但文本大于12，高度始终显示为21 ！！即使我将高度和文本大小值更改为极限大小，此代码也会创建一些无法调整的固定大小的标签.我似乎唯一可以减小的是宽度.

Ok, so the label appears, but the text is larger than 12 and the height always comes out to be 21!? Even if I change the height and text size values to extreme sizes, this code creates a label of some fixed size that can't be adjusted. The only thing I can seem to make smaller is the width.

我必须研究一些基本的知识，但是我真的无法弄清楚如何获得理想的结果，也无法理解为什么我会得到自己正在得到的行为.

I must be over looking something basic, but I really can't figure out how to get my desired result, nor do I understand why I'm getting the behavior that I am getting.

推荐答案

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];

edit:我相信您同时使用adjustsFontSizeToFitWidth和minimumScaleFactor可能会遇到问题.前者指出，您还需要设置一个minimumFontWidth(否则，根据我的测试，它可能会缩小到非常不可读的位置)，但已弃用并由后者取代.

edit : I believe you may encounter a problem using both adjustsFontSizeToFitWidth and minimumScaleFactor. The former states that you also needs to set a minimumFontWidth (otherwhise it may shrink to something quite unreadable according to my test), but this is deprecated and replaced by the later.

不要紧，过时的文档. adjustsFontSizeToFitWidth需要minimumScaleFactor，只需确保不将其作为minimumScaleFactor传递0(整数除法，10/12返回0). baselineAdjustment值也有小的变化.

edit 2 : Nevermind, outdated documentation. adjustsFontSizeToFitWidth needs minimumScaleFactor, just be sure no to pass it 0 as a minimumScaleFactor (integer division, 10/12 return 0). Small change on the baselineAdjustment value too.

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