iOS开发教程之仿写UITabBarController。效果图如下:
知识点:
1. 界面布局, 底部的button和显示的子控制器都分别使用用UIView来存放,方便后面使用.
2. 使用父子控制器知识,将所有的子控制器添加到ViewController中.
3. 通过遍历ViewController中的子控制器,来给button设置标题.
4. 当点击button的时候,将对应的子控件添加上去.并移除之前的界面( makeObjectPerformSelecter: )
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// Created by 朝阳 on 2018/2/2.
// Copyright ? 2018年 sunny. All rights reserved.
//
#import "ViewController.h"
#import "SocialViewController.h"
#import "HeadLineViewController.h"
#import "HotViewController.h"
@interface ViewController ()
/* 管理btn的stack */
@property (weak, nonatomic) IBOutlet UIStackView *btnsView;
/* 存放子控制器的View */
@property (weak, nonatomic) IBOutlet UIView *saveChildVcView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//1.添加子控制器
[self addChildController];
//2.给按钮设置标题
[self setBtnTitle];
}
#pragma -mark 设置按钮的标题
- (void)setBtnTitle
{
for (NSInteger i = 0; i < self.btnsView.subviews.count; ++i) {
UIButton *btn = self.btnsView.subviews[i];
// 获取self中的子控制器.根据子控制器来设置按钮的标题.
UIViewController *vc = self.childViewControllers[i];
[btn setTitle:vc.title forState:UIControlStateNormal];
}
}
#pragma -mark 添加所有子控制器
- (void)addChildController
{
SocialViewController *socialVC = [[SocialViewController alloc] init];
socialVC.title = @"社会";
[self addChildViewController:socialVC];
HeadLineViewController *headLineVC = [[HeadLineViewController alloc] init];
headLineVC.title = @"头条";
[self addChildViewController:headLineVC];
HotViewController *hotVC = [[HotViewController alloc] init];
hotVC.title = @"热点";
[self addChildViewController:hotVC];
}
- (IBAction)btnClick:(UIButton *)sender {
// 当显示下一个界面时,移除之前的界面. makeObjectsPerformSelector: 使view中的所有子控制器都执行一次removeFromSuperview方法.
[self.saveChildVcView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
// for (UIView *vcView in self.saveChildVcView.subviews) {
// [vcView removeFromSuperview];
// }
// 把对应子控件的view添加上去
UIViewController *vc = self.childViewControllers[sender.tag];
vc.view.backgroundColor = sender.backgroundColor;
vc.view.frame = self.saveChildVcView.bounds;
[self.saveChildVcView addSubview:vc.view];
}
@end
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