上下文应用

ViewController.h

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
//设置成员变量
//成员变量和属性的区别:成员属于私有;属性属于共有;
{
    UIView * _aboveView;
    UIView * _downView;
}
@property (nonatomic,retain)NSMutableArray * aboveArray;//保存上面视图显示的按钮的名字,存储类型为NSString
@property (nonatomic,retain)NSMutableArray * downArray;//保存下面视图显示的按钮的名字,存储类型为NSString
@end

ViewController.m

#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)dealloc
{
    [_aboveArray release];
    [_downArray release];
    _aboveArray = nil;
    _downArray = nil;
                            
    [super dealloc];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
                                
        self.aboveArray = [NSMutableArray array];
                                
        self.downArray = [NSMutableArray array];
                                
        [_downArray addObject:@"啊啊"];
        [_downArray addObject:@"呵呵"];
        [_downArray addObject:@"哈哈"];
        [_downArray addObject:@"吼吼"];
        [_downArray addObject:@"嘻嘻"];
        [_downArray addObject:@"嘿嘿"];
                                
    }
    return self;
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
                            
    [self createAboveView];
    [self createAboveButton];
    [self createDownView];
    [self createDownButton];
}
//创建上边视图,用来显示点击后的按钮的内容
- (void)createAboveView
{
    //创建一个视图叫做aboveView
    _aboveView = [[UIView alloc]initWithFrame:CGRectMake(0, 20, 320, (self.view.frame.size.height - 20.0)/2.0)];//上边栏会遮挡状态栏,所以要下移点儿y=20;
    [_aboveView setBackgroundColor:[UIColor purpleColor]];
    [self.view addSubview:_aboveView];
    [_aboveView release];
                            
}
//创建按钮,放在上面所创建的视图aboveView上
- (void)createAboveButton
{
    //将aboveView的所有子视图从父视图上移除掉
    for (UIView * aView1 in [_aboveView subviews]) {
        [aView1 removeFromSuperview];
    }
                            
                            
    //获得aboveArray数组内容的个数,用来创建有多少个按钮添加在aboveView上面
    int count = [self.aboveArray count];
                            
    for (int i = 0; i < count ; i++) {
                                
        //获得X轴的坐标,因为每行显示三个按钮,所以应该通过i%3来获得余数,得到余数再乘以每个按钮的宽度与间距10的和,最后添加10为最初的与边框的间距位置
        CGFloat x = (i%3)*80 + 10;
                                
        //获得Y轴的坐标,因为每行最多三个按钮;
        CGFloat y = (i/3)*50;
                                
        UIButton * button = [[UIButton alloc]initWithFrame:CGRectMake(x, y, 70, 40)];
                                
        //i为数组里面相对应的字符串的下标,通过下标取得相对应数组里面的字符串.
        NSString * name = [self.aboveArray objectAtIndex:i];
        [button setTitle:name forState:UIControlStateNormal];
        [button addTarget:self action:@selector(aboveAction:) forControlEvents:UIControlEventTouchUpInside];
        [_aboveView addSubview:button];
        [button release];
    }
}
//创建下边视图,用来显示点击后的按钮的内容
- (void)createDownView
{
    //创建一个视图叫做downView
    _downView = [[UIView alloc]initWithFrame:CGRectMake(0, (self.view.frame.size.height- 20)/2.0+20, 320, (self.view.frame.size.height - 20.0)/2.0)];
    [_downView setBackgroundColor:[UIColor blueColor]];
    [self.view addSubview:_downView];
    [_downView release];
}
//创建按钮,放在上面所创建的视图downView上
- (void)createDownButton
{
                            
    //将downView的所有子视图从父视图上移除掉
    for (UIView * aView in [_downView subviews]) {
        [aView removeFromSuperview];
    }
                         
                            
    //获得downArray数组内容的个数,用来创建有多少个按钮添加在downView上面
    int count1 = [self.downArray count];
                            
    for (int i = 0; i < count1 ; i++) {
                                
        //获得X轴的坐标,因为每行显示三个按钮,所以应该通过i%3来获得余数,得到余数再乘以每个按钮的宽度与间距10的和,最后添加10为最初的与边框的间距位置
        CGFloat x = (i%3)*80 + 10;
                                
        //获得Y轴的坐标,因为每行最多三个按钮;
        CGFloat y = (i/3)*50;
                                
        UIButton * button1 = [[UIButton alloc]initWithFrame:CGRectMake(x, y, 70, 40)];
                                
        //i为数组里面相对应的字符串的下标,通过下标取得相对应数组里面的字符串.
        NSString * name1 = [self.downArray objectAtIndex:i];
        [button1 setTitle:name1 forState:UIControlStateNormal];
        [button1 addTarget:self action:@selector(downAction:) forControlEvents:UIControlEventTouchUpInside];
        [_downView addSubview:button1];
        [button1 release];
    }
}
//创建一个按钮的响应事件,让按钮上去
- (void)downAction:(id)sender
{
    UIButton * button1 = (UIButton *)sender;//强转(UIButton *)
                            
    NSString * name = button1.currentTitle;
                            
    //根据名字获得其在数组中的下标
    NSInteger index = [self.downArray indexOfObject:name];
                            
    //将名字从数组中删除
    [self.downArray removeObjectAtIndex:index];
                            
    //将名字放到上面的aboveArray的数组中
    [self.aboveArray addObject:name];
                            
    [self createDownButton];
    [self createAboveButton];
}
//创建一个按钮的响应事件,让按钮下去
- (void)aboveAction:(id)sender
{
    UIButton * button1 = (UIButton *)sender;//强转(UIButton *)
                            
    NSString * name = button1.currentTitle;
                            
    //根据名字获得其在数组中的下标
    NSInteger index = [self.aboveArray indexOfObject:name];
                            
    //将名字从数组中删除
    [self.aboveArray removeObjectAtIndex:index];
                            
                            
    //将名字放到上面的downArray的数组中
    [self.downArray addObject:name];
                            
    [self createDownButton];
    [self createAboveButton];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end

   

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