UIButton的Image和Title的布局

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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：

button.titleEdgeInsets = UIEdgeInsetsZero;button.imageEdgeInsets = UIEdgeInsetsZero;

设置如下布局后，图片和文字都居中显示。

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);

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：

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);

如果觉得图片和文字离的太近了，稍微分开一点：

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);

文字左对齐，图片右对齐

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);

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