UIView的基本应用

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#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    #if 0      //UI-view 视图,基础单元（UI的基类）    UIView * view1 = [[UIView alloc]init];    //1.位置和大小 2.加载在父视图中    //320x480px  状态栏 20px    //位置大小    //view1.frame=self.window.bounds;整个屏幕    view1.frame = CGRectMake(10, 30, 300, 440);    //设置背景颜色    view1.backgroundColor = [UIColor blueColor];    [self.view addSubview:view1];        //同一个父视图中后加入的控件盖在上面    UIView * view2 = [[UIView alloc]initWithFrame:CGRectMake(10, 10, 50, 50)];    view2.backgroundColor = [UIColor redColor];    [self.view addSubview:view2];        //坐标是相对父视图来进行设置的，遮挡关系是根据最大的父视图进行判定，    //再逐一判定每个子视图的子视图    UIView * view3 = [[UIView alloc]initWithFrame:CGRectMake(10, 10, 50, 50)];    view3.backgroundColor = [UIColor orangeColor];    [view1 addSubview:view3];        //调整遮挡关系    //1.将某一个子视图放在最上层    [self.view bringSubviewToFront:view1];    //2.将某一个子视图放在最下层    [self.view sendSubviewToBack:view1];    //3.交换两个层的视图    [self.view exchangeSubviewAtIndex:0 withSubviewAtIndex:1];    //4.将子视图加到某一个子视图下层    UIView * view4 = [[UIView alloc]initWithFrame:CGRectMake(20, 20, 50, 50)];    view4.backgroundColor = [UIColor cyanColor];    [self.view insertSubview:view4 belowSubview:view2];    //5.将子视图加入到某个子视图上方    UIView * view5 = [[UIView alloc]initWithFrame:CGRectMake(5, 10, 100, 30)];    view5.backgroundColor = [UIColor brownColor];    [self.view insertSubview:view5 aboveSubview:view1];    //6.将子视图加入到特定层    UIView * view6 = [[UIView alloc]initWithFrame:CGRectMake(20, 20, 50, 50)];    view6.backgroundColor = [UIColor whiteColor];    [self.view insertSubview:view6 atIndex:4];        NSLog(@"%f %f %f %f",view1.frame.origin.x,view1.frame.origin.y,view1.frame.size.width,view1.frame.size.height);        NSLog(@"%f %f %f %f",view1.bounds.origin.x,view1.bounds.origin.y,view1.bounds.size.width,view1.bounds.size.height);//只能打印宽高        //center    NSLog(@"%f %f",view1.center.x,view1.center.y);        //获得父视图    UIView * superView = view1.superview;    NSLog(@"%@",superView);        //获得子视图（多个）    NSArray * subViewsaArray = view1.subviews;    NSLog(@"%@",subViewsaArray);        //tag - 标识    view1.tag = 1001;    //通过tag找到子视图    //UIWindow * tagView = [_window viewWithTag:1001];    //tagView.backgroundColor = [UIColor lightGrayColor];        /*     < iOS6 UIView 自适应来做屏幕适配     iOS6~iOS8 AutoLayout     iOS8> AutoLayout+ SizeClass     */    #endif    UIView * backView = [[UIView alloc]initWithFrame:CGRectMake(110, 200, 100, 100)];    backView.backgroundColor = [UIColor yellowColor];    [self.view addSubview:backView];        backView.tag = 1002;    //准许子视图跟随改变    backView.autoresizesSubviews = YES;        UIView * topView = [[UIView alloc]initWithFrame:CGRectMake(25, 25, 50, 50)];    topView.backgroundColor = [UIColor greenColor];    //2.设置子视图跟随方式    topView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleRightMargin;//多种变化方式用|    [backView addSubview:topView];        //定时器    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeTick) userInfo:nil repeats:YES];        //剪裁超出俯视图范围的子视图//    view1.clipsToBounds = YES;        // Do any additional setup after loading the view, typically from a nib.}- (void)timeTick {    UIView *backView = [self.view viewWithTag:1002];    backView.frame = CGRectMake(backView.frame.origin.x-2, backView.frame.origin.y-2, backView.frame.size.width+4, backView.frame.size.height+4);    }
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