//

//  ViewController.m

//  UI1_UIView层操作

//

//  Created by zhangxueming on 15/7/1.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

      //self.view.backgroundColor=[UIColor cyanColor];

    // Do any additional setup after loading the view, typically from a nib.

    UIView *redView = [[UIView alloc] initWithFrame:CGRectMake(10, 100, 320, 100)];

    redView.backgroundColor = [UIColor redColor];

    [self.view addSubview:redView];

    UIView *greenView = [[UIView alloc] initWithFrame:CGRectMake(20, 140, 320, 100)];

    greenView.backgroundColor = [UIColor greenColor];

    [self.view addSubview:greenView];

    UIView *yellowView = [[UIView alloc] initWithFrame:CGRectMake(30, 180, 320, 100)];

    yellowView.backgroundColor = [UIColor yellowColor];

    yellowView.alpha= 1.0;//值越大越不透明

    [self.view addSubview:yellowView];

    //先添加的视图在self.view的最底层, 后添加的视图在self.view的最顶层

    //父视图 子视图

    //获取父视图

    UIView *superView = [redView superview];

    superView.backgroundColor = [UIColor cyanColor];

    [yellowView superview].backgroundColor = [UIColor whiteColor];

    //获取子视图数组

    NSArray *subViews = [self.view subviews];

    ((UIView *)[subViews objectAtIndex:0]).backgroundColor = [UIColor orangeColor];

    NSLog(@"count = %li", subViews.count);

    //把子视图移到最顶层显示

    [self.view bringSubviewToFront:redView];

    //把子视图移动到最底层显示

    [self.view sendSubviewToBack:redView];

    UIView *insertView = [[UIView alloc] initWithFrame:CGRectMake(10, 160, 350, 100)];

    insertView.backgroundColor = [UIColor blueColor];

    //在指定下标位置增加视图

    //[self.view insertSubview:insertView atIndex:1];

    //在指定视图上层增加视图

    //[self.view insertSubview:insertView aboveSubview:greenView];

    //在指定视图下层增加视图

    [self.view insertSubview:insertView belowSubview:greenView];

    //交换两个位置的视图

    [self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:3];

      self.view.backgroundColor=[UIColor cyanColor];

    //[self.view removeFromSuperview];

    if([self.view superview])

    {

        NSLog(@"23");

    }

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end