如何布局包含Image和Title的UIButton

UIButton中的titleEdgeInsets和imageEdgeInsets可以管理button中image和title的布局。 

1.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;

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2.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);

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3.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);

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4.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);

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5.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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