iOS开发小功能之九：五句代码搞定简单的父子控制器

#import "ViewController.h"
#import "ZWOneViewController.h"
#import "ZWTwoViewController.h"
#import "ZWThreeViewController.h"
@interface ViewController ()
/** 正在显示的控制器 */
@property (weak, nonatomic)UIViewController *showingVC;
/** 控制器数组 */
@property (strong, nonatomic)NSArray *allVCs; //代替控制器的三个属性

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.allVCs = @[
                    [[ZWOneViewController alloc] init],
                    [[ZWTwoViewController alloc] init],
                    [[ZWThreeViewController alloc] init]
                    ];
}
- (IBAction)buttonClick:(UIButton *)button {
    //移除当前显示的控制器
    [self.showingVC.view removeFromSuperview];
    //获得控制器的位置索引
    NSUInteger index = [button.superview.subviews indexOfObject:button];
    //添加控制器View
    self.showingVC = self.allVCs[index];
    //设置尺寸
    self.showingVC.view.frame = CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height - 64);
    //添加到控制器上
    [self.view addSubview:self.showingVC.view];
}