UILTView经典知识点练习-阿里云开发者社区

作者：韩俊强未经允许，请勿转载！

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声明：UILTView 指：UILabel 和 UITextField 的复合

#import "AppDelegate.h"

@interface AppDelegate ()<UITextFieldDelegate>

@end

@implementation AppDelegate
- (void)dealloc{
self.window = nil;
[super dealloc];

}

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

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

//主视图

UIView *contenView = [[UIView alloc]initWithFrame:[UIScreen mainScreen].bounds];

contenView.tag = 300;

contenView.backgroundColor = [UIColor brownColor];

    [self.window addSubview:contenView];
    [contenView release];

    //数据源：是用来提供数据
    //label上的数据
    NSArray *texts = @[@"用户名",@"密码",@"确认密码",@"手机号",@"邮箱"];
//textField上的数据

NSArray *placegolds = @[@"请输入用户名",@"请输入密码",@"请再次确认密码",@"请输入手机号",@"请输入邮箱"];

———————————————————————————————————————

for循环布局：

for (int i = 0; i < 5; i ++) {
 UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(20, 40 + 50 *i, 60, 30)];
 label.backgroundColor = [UIColor greenColor];
 label.text = texts[i];
 label.layer.cornerRadius = 10;//切圆角
 label.layer.masksToBounds = YES;
 label.tag = 100 + i;

label.font = [UIFont boldSystemFontOfSize:15];

label.textAlignment = NSTextAlignmentCenter;//居中对齐

[contenView addSubview:label];
[label release];

UITextField *field = [[UITextField alloc]initWithFrame:CGRectMake(100, 40 + 50 * i, 200,30)];

field.placeholder = placegolds[i];//输入提示内容

        field.borderStyle = UITextBorderStyleRoundedRect;
        field.backgroundColor = [UIColor cyanColor];

          field.tag = 200 + i;
        //添加代理
        field.delegate =self;
        [contenView addSubview:field];
        [field release];

if (1 == i || 2 == i) {

field.secureTextEntry = YES;//加密框显示

}

if (3 == i ) {

field.keyboardType = UIKeyboardTypeNumberPad;//显示数字键盘

}

——————————————————————————————————

    //登录
    UIButton *loginBotton = [UIButton buttonWithType:UIButtonTypeSystem];
    loginBotton.frame = CGRectMake(40, 300, 100, 30);
    loginBotton.backgroundColor = [UIColor yellowColor];
    [loginBotton setTitle:@"登录" forState:UIControlStateNormal];

    [contenView addSubview:loginBotton];
    //注册
    UIButton *signBotton = [UIButton buttonWithType:UIButtonTypeSystem];
    signBotton.frame = CGRectMake(180, 300, 100, 30);
    signBotton.backgroundColor = [UIColor yellowColor];
    [signBotton setTitle:@"注册" forState:UIControlStateNormal];

    [contenView addSubview:signBotton];

// Override point for customization after application launch.
 self.window.backgroundColor = [UIColor whiteColor];
 [self.window makeKeyAndVisible];
 return YES;
}
=================================================
//点击空白回收键盘
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
 //获取父视图
 UIView *contenView = [self.window viewWithTag:300];
 for (int i = 0; i < 5; i ++ ) {
 UITextField *field = (UITextField *)[contenView viewWithTag:200 + i];
 [field resignFirstResponder];
 }

}

//textField 点return回收键盘

- (BOOL)textFieldShouldReturn:(UITextField *)textField;{
[textField resignFirstResponder];
return YES;
}

例子：对上例题优化

建立LTView子类，继承自UIView

LTView.h

#import

@interface LTView : UIView
@property (nonatomic,retain)UILabel *label;
@property (nonatomic,retain)UITextField *field;

@end

LTView.m

@implementation LTView
//释放LT
- (void)dealloc{
    self.label = nil;
    self.field = nil;
    [super dealloc];

}

//重写父类的初始化方法
- (instancetype)initWithFrame:(CGRect)frame{
if (self = [super initWithFrame:frame]) {

[self p_setup]; //调用封装

}
return self;

}

//封装成一个方法建议用_label，因为用seif.容易和后面的CGRectMake（self.）混淆

- (void)p_setup{
    _label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width / 2,self.frame.size.height)];
//    _label.backgroundColor = [UIColor blueColor];
    [self addSubview:_label];
    [_label release];
    _field = [[UITextField alloc]initWithFrame:CGRectMake(self.frame.size.width / 2, 0,self.frame.size.width / 2, self.frame.size.height)];
//    _field.backgroundColor = [UIColor cyanColor];
    [self addSubview:_field];
    [_field release];

}

UIView *contenView = [[UIView alloc]initWithFrame:[UIScreen mainScreen].bounds];

contenView.tag = 300;

contenView.backgroundColor = [UIColor whiteColor];

[self.window addSubview:contenView];
[contenView release];

//=============================================

AppDelegate.m

记得引入子类头文件 #import "LTView.h"

    //数据源：是用来提供数据
    //label上的数据
    NSArray *texts = @[@"用户名",@"密码",@"确认密码",@"手机号",@"邮箱"];
//textField上的数据

NSArray *placegolds = @[@"请输入用户名",@"请输入密码",@"请再次确认密码",@"请输入手机号",@"请输入邮箱"];

// {(20,40 + 50*i),(280,30)}

//我们管我们自己定义的控件叫做自定义复合视图，因为系统没有为我们提供需要的控件；
 for (int i = 0; i < 5; i ++) {
 LTView *view = [[LTView alloc]initWithFrame:CGRectMake(20, 40 + 50 * i, 280, 30)];
 //给label赋值
 view.label.text =texts[i];
 //给field赋值
 view.field.placeholder = placegolds[i];
 //设置代理
 view.field.delegate = self;
 //给view设置tag值

view.tag = 200 + i;

        view.backgroundColor = [UIColor whiteColor];
        [contenView addSubview:view];
        [view release];

    }    //登录
    UIButton *loginBotton = [UIButton buttonWithType:UIButtonTypeSystem];
    loginBotton.frame = CGRectMake(40, 300, 100, 30);
    loginBotton.backgroundColor = [UIColor yellowColor];

[loginBotton setTitle:@"登录" forState:UIControlStateNormal];

    [contenView addSubview:loginBotton];
    //注册
    UIButton *signBotton = [UIButton buttonWithType:UIButtonTypeSystem];
    signBotton.frame = CGRectMake(180, 300, 100, 30);
    signBotton.backgroundColor = [UIColor yellowColor];

[signBotton setTitle:@"注册" forState:UIControlStateNormal];

[contenView addSubview:signBotton];

————————————————————————————

//重写点击空白回收键盘
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
 // //获取父视图
 UIView *contenView = [self.window viewWithTag:300];
 for (int i = 0; i < 5; i ++) {
 //此时contentView 上的控件是我们自定义出来的LTView，所以根据Tag取出控件应该转换为LTView类型
 LTView *view = (LTView *)[contenView viewWithTag:200 + i];
 [view.field resignFirstResponder];

}

—————————————————————————————

//点击return收回键盘

- (BOOL)textFieldShouldReturn:(UITextField *)textField;{
[textField resignFirstResponder];
return YES;

}

回到本节知识汇总： http://blog.sina.com.cn/s/blog_814ecfa90102vvb0.html

欢迎学习本文档，未经博主允许，不得私自转载！

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