UILabel里当多行时,设置行距的大小

最新推荐文章于 2020-07-24 16:51:02 发布

原创最新推荐文章于 2020-07-24 16:51:02 发布 · 595 阅读

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#UILabel的间距设置 #uilabel

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本文介绍如何在iOS开发中调整弹窗内公告文本的行间距，通过自定义UILabel的方法实现不同行距的设置，并提供了详细的代码示例。

在做一次弹框的时候,里面显示的是一个公告,需要设置行距的大小.

#define UISCREEN_WIDTH [UIScreen mainScreen].bounds.size.width

@implementation UILabel (StringFrame)

- (CGSize)sizeWithText:(NSString *)text andFont:(UIFont *)font andMaxSize:(CGSize)maxSize

{

NSDictionary *atts = @{NSFontAttributeName : font};

return [text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:atts context:nil].size;

}

lineSpacing 行间距

width 指UILabel的宽度

- (CGSize)multipleLinesSizeWithLineSpacing:(CGFloat)lineSpacing andText:(NSString *)text andTextWidth:(CGFloat)width{

self.numberOfLines = 0;

CGFloat oneRowHeight = [text sizeWithAttributes:@{NSFontAttributeName:self.font}].height;

CGSize textSize = [text boundingRectWithSize:CGSizeMake(width, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.font} context:nil].size;

NSMutableAttributedString * attributedString1 = [[NSMutableAttributedString alloc] initWithString:text];

NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];

paragraphStyle.alignment = NSTextAlignmentJustified;

[paragraphStyle setLineSpacing:lineSpacing];

[attributedString1 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [text length])];

CGFloat rows = textSize.height / oneRowHeight;//rows 是label有几行

CGFloat realHeight = oneRowHeight;

if (rows > 1) { //当只有一行的时候,label的位置会被间距给占

realHeight = (rows * oneRowHeight) + (rows - 1) * lineSpacing;

}else if(rows <= 1){

realHeight = oneRowHeight+lineSpacing;

}

[self setAttributedText:attributedString1];

return CGSizeMake(textSize.width, realHeight);

}