视图的层次结构 - c++编程基础

AppDelegate.m
#import "AppDelegate.h"
#import "TestView.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    
    //设置未读信息数
//    application.applicationIconBadgeNumber = 9;
    
    /*______________________________frame、bounds和center_____________________________________*/
    //坐标系的零点是在状态栏上面
    //创建视图
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(50, 20, 90, 90)];
    //设置视图的颜色
    view.backgroundColor = [UIColor redColor];
    
    //以其父视图的起点为原点
    view.frame = CGRectMake(0, 20, 320, 40);    //center: 160  40
    
    //错误，  bounds的x和y必须为零，它可以改变设置大小，不可以改变位置
//    view.bounds = CGRectMake(10, 20, 90, 90);
    
    //center是用来表示视图的中心位置的，可以改变视图的位置，不可以改变视图的大小
//    view.center = CGPointMake(160, 120);
    
    CGRect bounds = view.bounds;
    //NSStringFromCGRect将结构体类型的CGRect转换成字符串
    NSString *str = NSStringFromCGRect(bounds);
    NSLog(@"str:%@",str);
    
    //添加到window上显示
    [self.window addSubview:view];
    [view release];

    /*__________________________视图的层次结构___________________________*/
    
    //创建父视图
    UIView *superView = [[UIView alloc] initWithFrame:CGRectMake(0, 80, 320, 300)];
    superView.backgroundColor = [UIColor blackColor];
    //添加到window上面显示
    [self.window addSubview:superView];//retain
    [superView release];
    
    //给superView添加子视图
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(10, 20, 300, 200)];
    view1.backgroundColor = [UIColor greenColor];
    //添加到supView上面显示
    [superView addSubview:view1];
    [view1 release];
    
    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(20, 40, 300, 160)];
    view2.backgroundColor = [UIColor orangeColor];
    //添加到supView上显示
//    [superView addSubview:view2];
    
    //将视图插入到superView子视图的下面，索引为0
    [superView insertSubview:view2 atIndex:0];
    
    //将view2作为supView的子视图插入到view1的上面
    [superView insertSubview:view2 aboveSubview:view1];
    
    //将view2作为supView的子视图插入到view1的下面
    [superView insertSubview:view2 belowSubview:view1];
    
    [view2 release];
    
    //将view2作为supView的子视图移动到最上面
    [superView bringSubviewToFront:view2];
    
    //将view2作为supView的子视图移动到最下面
    [superView sendSubviewToBack:view2];
    
    




//交换superView两个子视图的位置
    [superView exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
    
    //取得当前视图的父视图view1.superview;
    NSLog(@"%@",view1.superview);
    
    //如果想判断一个视图是否在显示，可以判断view.superview是否存在
    
    //将view1从父视图上移除
    if (view1.superview != nil) {
        [view1 removeFromSuperview];
    }
    //注意：
//    removeFromSuperview只是将视图从父视图上面移除，但是不是销毁，还是在内存中存在的
    NSLog(@"view1:%@",view1);
    
    
    /*__________________________UIView的常用属性___________________________*/
    
    //1.透明度,范围是 [0，1]
    //注意：如果你设置父视图的透明度，子视图的这个属性也会跟着变化
//    superView.alpha = .5;
//    view2.alpha = .5;
    
    //2.背景颜色
//    clearColor是透明的
    superView.backgroundColor = [UIColor greenColor];
    //用过三色值设置颜色
//    superView.backgroundColor = [UIColor colorWithRed:<#(CGFloat)#> green:<#(CGFloat)#> blue:<#(CGFloat)#> alpha:<#(CGFloat)#>]
    
    //3.subviews得到视图的所有子视图
    NSArray *views = superView.subviews;
    for (UIView *view in views) {
        view.backgroundColor = [UIColor darkGrayColor];
    }
    
    //4.hidden 隐藏
//    view2.hidden = YES;
    
    //5.superview得到当前视图的父视图
    NSLog(@"supView:%@",superView);
    NSLog(
视图的层次结构(一)
