UIButton在Objective c中划线

本文介绍了UIButton在Objective c中划线的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

正常下划线有效，但虚线下划线似乎不起作用？

Normal underline works but dotted undeline doesn't seems to work?

UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom]; 
btn.frame = CGRectMake(100, 10, 300, 300);
NSMutableAttributedString *titleString = [[NSMutableAttributedString alloc] initWithString:@"Durga Vundavalli"];

// making text property to underline text-
[titleString addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:NSMakeRange(0, [titleString length])];

// using text on button
[btn setAttributedTitle: titleString forState:UIControlStateNormal];
[self.view addSubview:btn];

以下是文档中的枚举：

typedef NS_ENUM(NSInteger, NSUnderlineStyle) {
    NSUnderlineStyleNone                                = 0x00,
    NSUnderlineStyleSingle                              = 0x01,
    NSUnderlineStyleThick NS_ENUM_AVAILABLE_IOS(7_0)    = 0x02,
    NSUnderlineStyleDouble NS_ENUM_AVAILABLE_IOS(7_0)   = 0x09,

    NSUnderlinePatternSolid NS_ENUM_AVAILABLE_IOS(7_0)      = 0x0000,
    NSUnderlinePatternDot NS_ENUM_AVAILABLE_IOS(7_0)        = 0x0100,
    NSUnderlinePatternDash NS_ENUM_AVAILABLE_IOS(7_0)       = 0x0200,
    NSUnderlinePatternDashDot NS_ENUM_AVAILABLE_IOS(7_0)    = 0x0300,
    NSUnderlinePatternDashDotDot NS_ENUM_AVAILABLE_IOS(7_0) = 0x0400,

    NSUnderlineByWord NS_ENUM_AVAILABLE_IOS(7_0) = 0x8000
}

推荐答案

你不能只放 NSUnderlinePatter nDot 。如果你想要2行点怎么办？你必须使用模式和风格。

You can't put only NSUnderlinePatternDot. What if you want 2 lines of dots? You have to use a Pattern and a Style.

[titleString addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:(NSUnderlinePatternDot|NSUnderlineStyleSingle)] range:NSMakeRange(0, [titleString length])];

您必须使用掩码，如文档中所述：

You have to use a mask, as said by the doc:

这篇关于UIButton在Objective c中划线的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！