UIButton内部文本和图片的布局是我们日常代码中,不可缺少的部分,按钮默认左边图片右边文本,那要实现左边文本,右边图片,我们该怎么解决呢,上面图片,下面文本又该怎么办呢
其实很简单,今天总结下,目前主要用两种方式,一种就是重写按钮,另一种就是通过setTitleEdgeInsets和setImageEdgeInsets方法解决
下图是按钮默认情况下的图文布局
左边文本,右边图片
首先介绍重写按钮吧,新建一个按钮继承UIButton,
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- ( void )layoutSubviews
{ [super layoutSubviews]; CGRect imageRect = self.imageView.frame;
imageRect.size = CGSizeMake(30, 30);
imageRect.origin.x = (self.frame.size.width - 30) ;
imageRect.origin.y = (self.frame.size.height - 30)/2.0f;
CGRect titleRect = self.titleLabel.frame;
titleRect.origin.x = (self.frame.size.width - imageRect.size.width- titleRect.size.width);
titleRect.origin.y = (self.frame.size.height - titleRect.size.height)/2.0f;
self.imageView.frame = imageRect; self.titleLabel.frame = titleRect;
} |
效果如下:
上面图片,下面文本
同样用重写按钮的方法
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- ( void )layoutSubviews{
[super layoutSubviews]; CGRect imageRect = self.imageView.frame;
imageRect.size = CGSizeMake(30, 30);
imageRect.origin.x = (self.frame.size.width - 30) * 0.5;
imageRect.origin.y = self.frame.size.height * 0.5 - 40; CGRect titleRect = self.titleLabel.frame;
titleRect.origin.x = (self.frame.size.width - titleRect.size.width) * 0.5;
titleRect.origin.y = self.frame.size.height * 0.5 ; self.imageView.frame = imageRect; self.titleLabel.frame = titleRect;
} |
效果如下:
![屏幕快照 2016-05-30 10.23.11.png](http://upload-images.jianshu.io/upload_images/616981-34430e2f6f66b344.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240
另一种方法就是通过setTitleEdgeInsets和setImageEdgeInsets方法解决
这种方法的最大好处,就是不要在重写UIButton,直接在新建的UIButton中改变上面两个属性的值就可以达到我们想要的结果
左边文本右边图片
代码如下:
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UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeCustom]; btn1.frame = CGRectMake(50, 100, 80, 40);
[btn1 setImage:[UIImage imageNamed:@ "icon_shouye" ] forState:UIControlStateNormal];
[btn1 setTitle:@ "首页" forState:UIControlStateNormal];
[btn1 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
btn1.backgroundColor = [UIColor redColor]; UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(50, 50, 80, 40);
[btn setImage:[UIImage imageNamed:@ "icon_shouye" ] forState:UIControlStateNormal];
[btn setTitle:@ "首页" forState:UIControlStateNormal];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
btn.backgroundColor = [UIColor redColor]; //上左下右
btn.imageEdgeInsets = UIEdgeInsetsMake(0, btn.frame.size.width - btn.imageView.frame.origin.x - btn.imageView.frame.size.width, 0, 0);
btn.titleEdgeInsets = UIEdgeInsetsMake(0, -(btn.frame.size.width - btn.imageView.frame.size.width ), 0, 0);
[self.view addSubview:btn1];
[self.view addSubview:btn];
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完全颠倒的效果
上面图片下面文本
代码如下:
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UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(50, 50, 80, 60);
[btn setImage:[UIImage imageNamed:@ "icon_shouye" ] forState:UIControlStateNormal];
[btn setTitle:@ "首页的事" forState:UIControlStateNormal];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
btn.backgroundColor = [UIColor redColor];
btn.imageEdgeInsets = UIEdgeInsetsMake(- (btn.frame.size.height - btn.titleLabel.frame.size.height- btn.titleLabel.frame.origin.y),(btn.frame.size.width -btn.titleLabel.frame.size.width)/2.0f -btn.imageView.frame.size.width, 0, 0);
btn.titleEdgeInsets = UIEdgeInsetsMake(btn.frame.size.height-btn.imageView.frame.size.height-btn.imageView.frame.origin.y, -btn.imageView.frame.size.width, 0, 0);
[self.view addSubview:btn];
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效果图:
关于setTitleEdgeInsets和setImageEdgeInsets下面进行一些解释:
UIButton内有两个控件titleLabel和imageView,可以用来显示一个文本和图片,这里的图片区别于背景图片。给UIButton设置了title和image后,它们会图片在左边,文本在图片右边显示。它们两个做为一个整体依赖于button的contentHorizontalAlignment居左居右或居中显示。
显示格式区分:
1.当button.width < image.width时,只显示被压缩后的图片,图片是按照fillXY的方式压缩。
2.当button.width > image.width,且button.width < (image.width+text.width)时,图片正常显示,文本被压缩。
3.当button.width > (image.width+text.width)时,两者并列默认居中显示,可通过button的属性contentHorizontalAlignment改变对齐方式。
想改变两个子控件的显示位置,可以分别通过setTitleEdgeInsets和setImageEdgeInsets来实现。对titleLabel和imageView设置偏移是针对他当前的位置起作用的,并不是针对距离button边框的距离的。
typedefNS_ENUM(NSInteger, UIControlContentHorizontalAlignment) {
UIControlContentHorizontalAlignmentCenter =0,//居中
UIControlContentHorizontalAlignmentLeft =1,//居左
UIControlContentHorizontalAlignmentRight =2,//居右
UIControlContentHorizontalAlignmentFill =3,//
想两改变两个子控件的显示位置,可以分别通过setTitleEdgeInsets和setImageEdgeInsets来实现。需要注意的是,对titleLabel和imageView设置偏移,是针对它当前的位置起作用的,并不是针对它距离button边框的距离的。感觉设置不设置UIControlContentHorizontalAlignmentCenter居中都没有影响,这个网上也找了些相关的信息,感觉都没有说到重点,我这里也没有完全理解透彻,之前都是在设置setTitleEdgeInsets和setImageEdgeInsets这些参数时都是不停的尝试得到的结果。目前这是我理解后,代码实现最后的答案,希望可以帮到大家。