ios学习第五天（三）View常用操作

来源：互联网发布：为什么谭咏麟你知我知编辑：程序博客网时间：2024/06/13 08:42

上一篇我们给一个view中添加了许多子view，现在对view进行操作，还是先看结果

看代码和注释：

////  ViewController.m//  HelloIOS////  Created by Moluth on 17/4/10.//  Copyright (c) 2017年 Moluth. All rights reserved.//#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor=[[UIColor alloc] initWithRed:0.3f green:0.35f blue:0.85f alpha:1.0f];        UIView *view1=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];//创建view ，view是矩形，0，0表示左上角坐标，后面的100，100代表宽高    view1.backgroundColor=[[UIColor alloc] initWithRed:0.88f green:0.66f blue:0.11f alpha:0.8f];//给新创建的view设置背景颜色，便于观察    [self.view addSubview:view1];//向ViewController中的view中添加子View        //下面代码都是对上面的复制和修改，仅仅是坐标和颜色不同    UIView *view2=[[UIView alloc] initWithFrame:CGRectMake(30, 30, 100, 100)];    view2.backgroundColor=[[UIColor alloc] initWithRed:1.0f green:0.0f blue:0.6f alpha:0.8f];    [self.view addSubview:view2];        UIView *view3=[[UIView alloc] initWithFrame:CGRectMake(60, 60, 100, 100)];    view3.backgroundColor=[[UIColor alloc] initWithRed:1.0f green:1.0f blue:0.6f alpha:0.8f];    [self.view addSubview:view3];        UIView *view4=[[UIView alloc] initWithFrame:CGRectMake(90, 90, 100, 100)];    view4.backgroundColor=[[UIColor alloc] initWithRed:0.0f green:1.0f blue:0.0f alpha:0.8f];    [self.view addSubview:view4];    /////////////////////////////////////下面是新添加的代码///////////////////////////////////////////////////    view1.alpha=0.9;//设置view1的透明度    view1.center=self.view.center;//让view1的中心点与父view中心点对齐    view1.tag=123;//设置标签        if([self.view viewWithTag:123]==view1){        NSLog(@"same");    }//输出 same        [self.view bringSubviewToFront:view2];//把view2放到前面显示    [self.view sendSubviewToBack:view4];//把view4放到后面面显示            /*     [view1 removeFromSuperview];//把view1从父view中移除     //那么     if([self.view viewWithTag:123]==view1){     NSLog(@"same");     }//可以输出 same吗？？？？？     */        //self.view        // Do any additional setup after loading the view, typically from a nib.}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

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