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