iOS新手入门之UITextField

UITextField可以进行文本输入, 可以用到的地方有很多, 比如登陆界面, 或者申请注册界面

#import "AppDelegate.h"@interface AppDelegate ()@end@implementation AppDelegate- (void)dealloc{    [_window release];    [super dealloc];}- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {   self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];    // Override point for customization after application launch.   self.window.backgroundColor = [UIColor whiteColor];   // 创建一个UITextField   UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200, 50)];   // 设置背景颜色   textField.backgroundColor = [UIColor greenColor];   // 设置占位符(输入框内直接显示出来的文本 如:输入密码框中有"请输入密码提示")   textField.placeholder = @"请输入密码";   // 设置颜色和大小   textField.textColor = [UIColor blackColor];   textField.font = [UIFont systemFontOfSize:20];   // 对齐方法(默认是左对齐)   textField.textAlignment = NSTextAlignmentCenter;   // 是否可以输入 默认是YES 等于NO的时候不能输入   textField.enabled = YES;   // 输入时变成圆点，密码模式 原点颜色是跟文本颜色一样一样的   textField.secureTextEntry = YES;   // 边框设置    textField.borderStyle = UITextBorderStyleRoundedRect;    // 显示TextField    [self.window addSubview:textField];    [textField release];    [self.window makeKeyAndVisible];    return YES;}