布局包含Image和Title的UIButton

UIButton中的titleEdgeInsets和imageEdgeInsets可以管理button中image和title的布局。 如果对其理解不够深入,用纯数字进行布局管理,经过不断的调试,还是能试出来的,但是如果改变了图片大小或文字长度,又要再来一遍。 作为程序猿,我们不应该放弃任何一个偷懒的机会。

  • 默认情况下,是图片在左,文字在右,垂直居中显示,如下图:
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button.titleEdgeInsets = UIEdgeInsetsZero;
button.imageEdgeInsets = UIEdgeInsetsZero;

customButton icon1

  • 设置如下布局后,图片和文字都居中显示。
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button.titleEdgeInsets = UIEdgeInsetsMake(0, -button.imageView.frame.size.width, 0, 0);
// button.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, -button.titleLabel.frame.size.width);
// 由于iOS8中titleLabel的size为0,用上面这样设置有问题,修改一下即可
button.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, -button.titleLabel.intrinsicContentSize.width);

customButton icon2

  • 如果想图片在上,文字在下,水平居中显示,则按下面设置即可:
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button.titleEdgeInsets = UIEdgeInsetsMake(0, -button.imageView.frame.size.width, -button.imageView.frame.size.height, 0);
// button.imageEdgeInsets = UIEdgeInsetsMake(-button.titleLabel.frame.size.height, 0, 0, -button.titleLabel.frame.size.width);
// 由于iOS8中titleLabel的size为0,用上面这样设置有问题,修改一下即可
button.imageEdgeInsets = UIEdgeInsetsMake(-button.titleLabel.intrinsicContentSize.height, 0, 0, -button.titleLabel.intrinsicContentSize.width);

customButton icon3

  • 如果觉得图片和文字离的太近了,稍微分开一点:
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CGFloat offset = 40.0f;
button.titleEdgeInsets = UIEdgeInsetsMake(0, -button.imageView.frame.size.width, -button.imageView.frame.size.height-offset/2, 0);
// button.imageEdgeInsets = UIEdgeInsetsMake(-button.titleLabel.frame.size.height-offset/2, 0, 0, -button.titleLabel.frame.size.width);
// 由于iOS8中titleLabel的size为0,用上面这样设置有问题,修改一下即可
button.imageEdgeInsets = UIEdgeInsetsMake(-button.titleLabel.intrinsicContentSize.height-offset/2, 0, 0, -button.titleLabel.intrinsicContentSize.width);

customButton icon4

  • 文字左对齐,图片右对齐
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button.titleEdgeInsets = UIEdgeInsetsMake(0, -button.imageView.frame.size.width - button.frame.size.width + button.titleLabel.intrinsicContentSize.width, 0, 0);
button.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, -button.titleLabel.frame.size.width - button.frame.size.width + button.imageView.frame.size.width);

customButton icon5