UITextField

import “AppDelegate.h”

@interface AppDelegate ()
@property(nonatomic, retain)UITextField *secondText;
@property(nonatomic, retain)UITextField *field;
@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    // Override point for customization after application launch.    self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    [_window release];**UITextField**    self.field = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 150, 50)];    self.field.backgroundColor = [UIColor purpleColor];    [self.window addSubview:self.field];    [self.field release];// 加上边框和弧度    self.field.layer.borderWidth = 1;    self.field.layer.cornerRadius = 10;    self.field.textColor = [UIColor redColor];    self.field.textAlignment = NSTextAlignmentCenter;*强调内容*    self.field.placeholder = @"请输入内容";    // 控制能否使用输入框    self.field.enabled = YES;    // 密码效果    self.field.secureTextEntry = YES;    // 键盘类型    self.field.returnKeyType = UIReturnKeyGo;    //  UIView *view = [[UIView alloc]    initWithFrame:CGRectMake(0, 0, 100, 200)];    // view.backgroundColor = [UIColor yellowColor];    // // 可以通过自定义的视图,取代键盘    // self.field.inputView = view;    // self.field.inputAccessoryView = view;// 清除按钮  self.field.clearButtonMode = UITextFieldViewModeAlways;// 给textField添加一个事件(用textField去调用一个方法)  [self.field addTarget:self action:@selector(valueChange:) forControlEvents:UIControlEventEditingChanged];    NSLog(@"%p", self.field);    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(100, 200, 150, 50)];    label.layer.borderWidth = 1;    label.layer.cornerRadius = 10;    [self.window addSubview:label];    [label release];    label.tag = 1000;    // 控件写成属性,一定要使用    self.secondText = [[UITextField alloc] initWithFrame:CGRectMake(100, 300, 150, 50)];    self.secondText.backgroundColor = [UIColor cyanColor];    [self.window addSubview:self.secondText];    [self.secondText release];    [self.secondText addTarget:self action:@selector(valueChange:) forControlEvents:UIControlEventEditingChanged];    NSLog(@"%p", _secondText);#warning 在给某些控件绑定方法的时候, 一般会在写方法的时候给一个同类型的参数,哪个控件去执行方法,对应的参数就是哪个对象,省去寻找出发事件的对象的麻烦    return YES; }

- (void)valueChange:(UITextField *)field  {    NSLog(@"%@", field.text);    *先通过tag值来找到指定的label*    UILabel *label = (UILabel *)[self.window viewWithTag:1000];    if([self.secondText.text isEqualToString:self.field.text]) {    label.text = @"相同";    } else {    label.text = @"不同";   }  }

@end