IOS-----手动创建Main界面

1.删除info.plist中的Main设置

2.创建MainViewController.h 和MainViewController.m

（1）布局界面：UIViewController

-(instancetype)init{
    self = [super init];
    if(self != nil){
        NSLog(@"init");
    }
    return self;
}

(2)设置ViewDidLoad

-(void)viewDidLoad{
    [super viewDidLoad];
    //创建视图 self.view 控件与控件之间可以相互添加
    self.orangeView = [[UIView alloc] init];
    //设置位置和大小 frame
    _orangeView.frame = CGRectMake(50, 20+44 + 50, 200, 300);
    /*设置圆角
    imageView.layer.masksToBounds = YES;
    imageView.layer.cornerRadius = 10.f; 
    */
    _orangeView.layer.cornerRadius = 150;
    //设置背景颜色backgroundColor
    _orangeView.backgroundColor = [UIColor orangeColor];
    //设置将超出显示区域的子视图 裁剪
    _orangeView.clipsToBounds = YES;
    //设置tag值 用来快速查找某个子视图
    _orangeView.tag = 1;
    //将orangeView添加到某个界面上(例：添加到self.view) addSubview
    [self.view addSubview:_orangeView];
    
    //给orangeView添加一个子视图
    UIView *redView = [[UIView alloc] init];
    redView.frame = CGRectMake(20, 20, 260, 260);
    redView.backgroundColor = [UIColor redColor];
    [_orangeView addSubview:redView];

    //给self.view添加一个子视图
    self.blackView = [[UIView alloc] init];
    _blackView.frame = CGRectMake(90, 150, 200, 200);
    _blackView.backgroundColor = [UIColor blackColor];
    _blackView.layer.cornerRadius = 100;
    [self.view addSubview:_blackView];
}

(3)界面的显示

//viewWillAppear界面即将产生
- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    NSLog(@"viewWillAppear");
}
//viewDidAppear界面已经产生
- (void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    NSLog(@"viewDidAppear");
}
//viewWillDisappear界面即将消失
- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    NSLog(@"viewWillDisappear");
}
//viewDidDisappear界面已经消失
- (void)viewDidDisappear:(BOOL)animated{
    [super viewDidDisappear:animated];
    NSLog(@"viewDidDisappear");
}

（4）点击相应事件：界面的开始（当手指触摸到屏幕）

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    //交换orangeView和blackView的层级关系
    //如何获取这个两个对象
    //方式一：通过子视图父视图的层级关系来获取
    UIView *v1 = [self.view.subviews objectAtIndex:0];
    UIView *v2 = [self.view.subviews objectAtIndex:1];
    [self.view bringSubviewToFront:v1];
    
    //方式二：通过view的tag属性 每一个控件都一个tag属性 整数 默认是0
    //viewWithTag方法通过tag获取一个子视图
    UIView *v1 = [self.view viewWithTag:1];
    [self.view bringSubviewToFront:v1];  
    //方式三：添加属性变量
    [self.view bringSubviewToFront:self.orangeView];
}

创建下一个界面SecondViewController.h和SecondViewController.m。配置界面

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor orangeColor];
}

（5）手指滑动屏幕

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    //获取手指的触摸位置 点的坐标
    //获取UITouch对象 touhes数组里面只有一个touch对象
    UITouch *touch = [touches anyObject];
    //获取touch对象在self.view上触摸点的坐标
    CGPoint touchPoint = [touch locationInView:self.view];
    //更改黑色视图的位置 center
    self.blackView.center = touchPoint;
}

 (6)手指离开屏幕

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

}