自定义一个图片在上，文字在下的按钮

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////  MenuItemButton.h#import <UIKit/UIKit.h>@interface MenuItemButton : UIButton@end

////  MenuItemButton.m#import "MenuItemButton.h"#define kImageRatio 0.8@implementation MenuItemButton- (void)awakeFromNib{    [self setup];}- (instancetype)initWithFrame:(CGRect)frame{    if (self = [super initWithFrame:frame]) {        [self setup];    }    return self;}- (void)setup{    self.imageView.contentMode = UIViewContentModeCenter;    self.titleLabel.textAlignment = NSTextAlignmentCenter;}// 如果通过代码设置子控件位置，都是在layoutSubviews里面- (void)layoutSubviews{    [super layoutSubviews];        // imageView    CGFloat imageX = 0;    CGFloat imageY = 0;    CGFloat imageW = self.bounds.size.width;    CGFloat imageH = self.bounds.size.height * kImageRatio;    self.imageView.frame = CGRectMake(imageX, imageY, imageW, imageH);        // titleLabel    CGFloat labelY = imageH;    CGFloat labelH = self.bounds.size.height - labelY;    self.titleLabel.frame = CGRectMake(imageX, labelY, imageW, labelH);}@end

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