UI1_UIView层操作

//
//  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