swift 自定义UIButton 图片在上 文字在下

1 首先继承UIButton

2 实现imageRectForContentRect titleRectForContentRect

// 内部图片的frame

- (CGRect)imageRectForContentRect:(CGRect)contentRect

{

CGFloat imageW = contentRect.size.width;

CGFloat imageH = contentRect.size.height * IWTabBarButtonImageRatio;

return CGRectMake(0, 0, imageW, imageH);

}

// 内部文字的frame

- (CGRect)titleRectForContentRect:(CGRect)contentRect

{

CGFloat titleY = contentRect.size.height * IWTabBarButtonImageRatio;

CGFloat titleW = contentRect.size.width;

CGFloat titleH = contentRect.size.height - titleY;

return CGRectMake(0, titleY, titleW, titleH);

}

- (id)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

// 图标居中

self.imageView.contentMode = UIViewContentModeCenter;

// 文字居中

self.titleLabel.textAlignment = NSTextAlignmentCenter;

}

return self;

}