让你一看就会的UI知识一

在UI的第一个.m文件中
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

#import "AppDelegate.h"

#import "ViewController.h"

@interface
AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary
*)launchOptions {

// 创建window，让其充满屏幕

self.window = [[UIWindow
alloc]initWithFrame:[UIScreen
mainScreen].bounds];

// 让window成为主窗口且可视

[self.window
makeKeyAndVisible];

// 设置背景色

self.window.backgroundColor = [UIColor
blueColor];

// 设置根视图控制器

self.window.rootViewController = [[ViewController
alloc ]init];

// Override point for customization after application launch.

return
YES;
}

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
在第二个UI.m文件中的程序

#import "ViewController.h"

@interface
ViewController ()

@end

@implementation ViewController
- (void)viewDidLoad {

[super
viewDidLoad];

self.view.backgroundColor =[UIColor
brownColor];

UIView *v1 = [[UIView
alloc]init];

UIView *v3 = [[UIView
alloc]init];

UIView *v5 = [[UIView
alloc]init];

UIView *v6 = [[UIView
alloc]init];

// 相对于父视图的位置，注意坐标和尺寸的合理性，保证坐标加尺寸不会超出父视图范围
v6.frame =
CGRectMake(100,
250, 100,
100);

v6.backgroundColor = [UIColor
orangeColor];
[self.view
addSubview:v6];

UIView *v7 = [[UIView
alloc]init];
v7.frame =
CGRectMake(50,
350, 50,
50);

v7.backgroundColor = [UIColor
orangeColor];
[self.view
addSubview:v7];

v5.frame =
CGRectMake(100,
100, -50, -50);

v5.backgroundColor = [UIColor
purpleColor];
[self.view
addSubview:v5];

v3.frame =
CGRectMake( 200,
200, 50,
50);

v3.backgroundColor = [UIColor
yellowColor];
[self.view
addSubview:v3];

// [v3 removeFromSuperview];

v3.userInteractionEnabled =
NO;
v1.frame =
CGRectMake(100,
100, 100,
100);

v1.backgroundColor = [UIColor
blueColor];

[self.view
addSubview:v1];

// 将后面的视图添加到前面的视图之上

// [self.view insertSubview:v1 atIndex:2];//将子视图添加到父视图的某个位置

[self.view
insertSubview:v3 atIndex:3];

// [self.view insertSubview:v3 aboveSubview:v1];

// 将v3添加到父视图，且在v1之上

// [self.view insertSubview:v3 belowSubview:v1];

// 将v3添加到父视图，且在v1之下

// [self.view exchangeSubviewAtIndex:0 withSubviewAtIndex:2];

// 交换两个位置的视图

// [self.view bringSubviewToFront:v1];

//将某个子视图移到父视图的最前方

[self.view
sendSubviewToBack:v3];

// 将某个子视图移到父视图的最底层

// 是否允许用户点击（默认YES）,如果设置成no，子视图不会覆盖父视图的点击事件

v1.userInteractionEnabled =
NO;

// self.view.userInteractionEnabled = NO;

// 如果父视图不允许交互，那么子视图的事件也会被屏蔽

// v3.tag = 2 ;

// 设置视图的标签

// v3.alpha = 1;

// 设置视图的透明度，0~1浮点

// self.view.alpha = 0;

// 如果父视图透明，那么子视图也会看不见

// v1.tag = 1 ;

//

// v1.alpha = 1;

// UIView *v4 = [self.view viewWithTag:2];

// v4.backgroundColor = [UIColor redColor];

// UIView *v2 = [self.view viewWithTag:1];

// 获取父视图中标签为1的视图

//

// v2.backgroundColor = [UIColor redColor];

// v1.hidden = NO;

// 设置视图是否隐藏（默认NO）

// self.view.hidden = YES;

// 如果父视图被隐藏，那么子视图也会被隐藏

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

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

NSLog(@"被点击");
}

对于初学者来说，要记很多的知识是必不可少的，只有积累的够多你才能用的时候更加灵活。