UILTView经典知识点练习-白红宇

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;

}

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