iOS新手入门之UITextField

#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;
}