.h文件中
#import <UIKit/UIKit.h>
//继承自UIView
@interface PYTarBar : UIView
//数组是用来接收UIButton的，实现点击的viewcontroller界面切换@property(nonatomic,retain)NSArray *items;
//类方法初始化tabBar
+ (id)tabBar;//block方法，观察button点击对象，实现具体跳转的界面
@property(nonatomic,copy)void (^tabbarItemSelected)(NSInteger index);@end
.m文件中
#import "PYTarBar.h"
//设置button的tag值#define btnTag 99@interface PYTarBar()
//可以通过这个来设置背景图片
@property(nonatomic,weak)UIImageView *background;
@end
@implementation PYTarBar
+ (id)tabBar{
return [[self alloc] init];}//懒加载背景图片的设置
- (UIImageView *)background{ if (!_background) { //设置背景图片 UIImageView *background = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"panelbottompart1"]]; background.frame = CGRectMake(0, 0, Screen_width, 60); //一定要打开交互性，否则无法实现点击 background.userInteractionEnabled = YES; //建立父子关系 [self addSubview:background]; //赋值 _background = background; } return _background;}//set方法实现items的的实现
- (void)setItems:(NSArray *)items{
//保存成员变量 _items = items; CGFloat aveWidth = (Screen_width - 10) / items.count; //添加子控件 for (int i = 0; i < items.count; i ++) { UIButton *btn = items[i]; [self.background addSubview:btn]; btn.tag = btnTag + i; //设置frame，必须先给确定的大小 btn.frame = CGRectMake( i*aveWidth, 0, aveWidth, 60); //添加响应事件 [btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside]; } //默认选中第一个选项 [self btnAction:items[0]];}//监听事件
- (void)btnAction:(UIButton *)btn{ if (btn.selected) { return; } //先清空就可以每次只选中一个 for (UIButton *tempBtn in self.items) { tempBtn.selected = NO; } btn.selected = YES; //通过tag值的临时标记来使用 NSInteger Index = btn.tag - btnTag;#pragma mark ======== 在这里修改selected的状态 if (self.tabbarItemSelected) { self.tabbarItemSelected(Index); }}#pragma mark ============= 系统提供的方法，当视图即将被安装到某一个视图； 并且会把目标视图指针地址传递进来
- (void)willMoveToSuperview:(UIView *)newSuperview{self.backgroundColor = [UIColor whiteColor];
self.frame = CGRectMake(0, newSuperview.frame.size.height - 60, newSuperview.frame.size.width, 60);}
@end