UI3_视图切换

//
//  ViewController.m
//  UI3_视图切换
//
//  Created by zhangxueming on 15/7/3.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "ViewController.h"
#import "SecondViewController.h"
#import "ThirdViewController.h"
#import "FourthViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor redColor];

SecondViewController *secondVC = [[SecondViewController alloc] init];
ThirdViewController *thirdVC = [[ThirdViewController alloc] init];
FourthViewController *fouthVC = [[FourthViewController alloc] init];

[self addChildViewController:secondVC];
[self addChildViewController:thirdVC];
[self addChildViewController:fouthVC];

NSLog(@"count = %li", self.childViewControllers.count);

UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeSystem];
btn1.frame = CGRectMake(20, 100, self.view.frame.size.width-40, 50);
btn1.backgroundColor = [UIColor whiteColor];
[btn1 setTitle:@"按钮1" forState:UIControlStateNormal];
[btn1 addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
btn1.tag = 100;
[self.view addSubview:btn1];

UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeSystem];
btn2.frame = CGRectMake(20, 200, self.view.frame.size.width-40, 50);
btn2.backgroundColor = [UIColor whiteColor];
[btn2 setTitle:@"按钮2" forState:UIControlStateNormal];
[btn2 addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
btn2.tag = 101;
[self.view addSubview:btn2];

UIButton *btn3 = [UIButton buttonWithType:UIButtonTypeSystem];
btn3.frame = CGRectMake(20, 300, self.view.frame.size.width-40, 50);
btn3.backgroundColor = [UIColor whiteColor];
[btn3 setTitle:@"按钮3" forState:UIControlStateNormal];
[btn3 addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
btn3.tag = 102;
[self.view addSubview:btn3];
}

- (void)btnClicked:(UIButton *)btn
{
//self.childViewControllers
if (btn.tag==100) {
[self.view addSubview:((UIViewController *)[self.childViewControllers objectAtIndex:0]).view];
}
else if(btn.tag ==101)
{
[self.view addSubview:((UIViewController *)[self.childViewControllers objectAtIndex:1]).view];
}
else if(btn.tag ==102)
{
[self.view addSubview:((UIViewController *)[self.childViewControllers objectAtIndex:2]).view];
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

//
//  FourthViewController.m
//  UI3_视图切换
//
//  Created by zhangxueming on 15/7/3.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "FourthViewController.h"

@interface FourthViewController ()

@end

@implementation FourthViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor yellowColor];
UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
btn.frame = CGRectMake(20, 100, self.view.frame.size.width-40, 50);
btn.backgroundColor = [UIColor whiteColor];
[btn setTitle:@"按钮" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}

- (void)btnClicked
{
if (self.view.superview) {
//移除子视图
[self.view removeFromSuperview];
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/

@end

//
//  ThirdViewController.m
//  UI3_视图切换
//
//  Created by zhangxueming on 15/7/3.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "ThirdViewController.h"

@interface ThirdViewController ()

@end

@implementation ThirdViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor greenColor];

UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
btn.frame = CGRectMake(20, 100, self.view.frame.size.width-40, 50);
btn.backgroundColor = [UIColor whiteColor];
[btn setTitle:@"按钮" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}

- (void)btnClicked
{
if (self.view.superview) {
//移除子视图
[self.view removeFromSuperview];
}
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/

@end

//
//  SecondViewController.m
//  UI3_视图切换
//
//  Created by zhangxueming on 15/7/3.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor blueColor];

UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
btn.frame = CGRectMake(20, 100, self.view.frame.size.width-40, 50);
btn.backgroundColor = [UIColor whiteColor];
[btn setTitle:@"按钮" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];

}

- (void)btnClicked
{
if (self.view.superview) {
//移除子视图
[self.view removeFromSuperview];
}
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/

@end