UITextField属性

text.borderStyle = UITextBorderStyleRoundedRect;
typedef enum {
   UITextBorderStyleNone, 
   UITextBorderStyleLine,
   UITextBorderStyleBezel,
   UITextBorderStyleRoundedRect  
} UITextBorderStyle;        

text.backgroundColor = [UIColor whiteColor];

//UITextField 的背景
text.background = [UIImage imageNamed:@"dd.png"];
//设置enable为no时，textfield的背景 
text.disabledBackground = [UIImage imageNamed:@"cc.png"];

text.placeholder = @"password";

text.font = [UIFont fontWithName:@"Arial" size:20.0f];

text.textColor = [UIColor redColor];

text.clearButtonMode = UITextFieldViewModeAlways; 
typedef enum {
   UITextFieldViewModeNever,　//重不出现
   UITextFieldViewModeWhileEditing, //编辑时出现
   UITextFieldViewModeUnlessEditing,　//除了编辑外都出现
   UITextFieldViewModeAlways 　//一直出现
} UITextFieldViewMode;

text.text = @"一开始就在输入框的文字";

text.secureTextEntry = YES;

text.autocorrectionType = UITextAutocorrectionTypeNo;
typedef enum {
   UITextAutocorrectionTypeDefault, //默认
   UITextAutocorrectionTypeNo, //不自动纠错
   UITextAutocorrectionTypeYes, //自动纠错
} UITextAutocorrectionType;

text.clearsOnBeginEditing = YES;

text.textAlignment = UITextAlignmentLeft;

text.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

textFied.adjustsFontSizeToFitWidth = YES;
//设置自动缩小显示的最小字体大小
text.minimumFontSize = 20;

text.keyboardType = UIKeyboardTypeNumberPad;
typedef enum {
   UIKeyboardTypeDefault, //默认键盘，支持所有字符         
   UIKeyboardTypeASCIICapable, //支持ASCII的默认键盘
   UIKeyboardTypeNumbersAndPunctuation, //标准电话键盘，支持＋＊＃字符
   UIKeyboardTypeURL, //URL键盘，支持.com按钮 只支持URL字符
   UIKeyboardTypeNumberPad, //数字键盘
   UIKeyboardTypePhonePad, //电话键盘
   UIKeyboardTypeNamePhonePad, //电话键盘，也支持输入人名
   UIKeyboardTypeEmailAddress, //用于输入电子 邮件地址的键盘     
   UIKeyboardTypeDecimalPad, //数字键盘 有数字和小数点
   UIKeyboardTypeTwitter, //优化的键盘，方便输入@、#字符
   UIKeyboardTypeAlphabet //Alphabet
} UIKeyboardType;

text.autocapitalizationType = UITextAutocapitalizationTypeNone;
typedef enum {
   UITextAutocapitalizationTypeNone, //不自动大写
   UITextAutocapitalizationTypeWords, //单词首字母大写
   UITextAutocapitalizationTypeSentences, //句子的首字母大写
   UITextAutocapitalizationTypeAllCharacters, //所有字母都大写
} UITextAutocapitalizationType;

text.returnKeyType =UIReturnKeyDone;
typedef enum {
   UIReturnKeyDefault, //默认灰色按钮，标有Return
   UIReturnKeyGo, //标有Go的蓝色按钮
   UIReturnKeyGoogle, //标有Google的蓝色按钮，用语搜索
   UIReturnKeyJoin, //标有Join的蓝色按钮
   UIReturnKeyNext, //标有Next的蓝色按钮
   UIReturnKeyRoute, //标有Route的蓝色按钮
   UIReturnKeySearch, //标有Search的蓝色按钮
   UIReturnKeySend, //标有Send的蓝色按钮
   UIReturnKeyYahoo, //标有Yahoo的蓝色按钮
   UIReturnKeyYahoo, //标有Yahoo的蓝色按钮
   UIReturnKeyEmergencyCall, //紧急呼叫按钮
} UIReturnKeyType;

textView.keyboardAppearance=UIKeyboardAppearanceDefault;
typedef enum {
   UIKeyboardAppearanceDefault, //默认外观，浅灰色
   UIKeyboardAppearanceAlert //深灰 石墨色
} UIReturnKeyType;

UIImageView *image=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"right.png"]];
text.rightView=image;
text.rightViewMode = UITextFieldViewModeAlways;
typedef enum {
   UITextFieldViewModeNever,
   UITextFieldViewModeWhileEditing,
   UITextFieldViewModeUnlessEditing,
   UITextFieldViewModeAlways
} UITextFieldViewMode;

- (BOOL)textFieldShouldReturn:(UITextField *)textField{
   [text resignFirstResponder];//主要是[receiver resignFirstResponder]在哪调用就能把receiver（text）对应的键盘往下收
   return YES;
}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
    return YES;//返回一个BOOL值，YES代表允许编辑，NO不允许编辑
}

- (void)textFieldDidBeginEditing:(UITextField *)textField{　
    //开始编辑时触发，文本字段将成为first responder　
}　

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{　 
    return NO;//要想在用户结束编辑时阻止文本字段消失，可以返回NO　
}
- (void)textFieldDidEndEditing:(UITextField *)textField;{
    //上面返回YES后执行;上面返回NO时有可能强制执行(e.g. view removed from window)
}

- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{　
　   return YES;//当用户使用自动更正功能，把输入的文字修改为推荐的文字时，就会调用这个方法。
}

- (BOOL)textFieldShouldClear:(UITextField *)textField{ 　　
　   return YES;//返回一个BOOL值指明是否允许根据用户请求清除内容　
}　

-(BOOL)textFieldShouldReturn:(UITextField *)textField{
　   return YES;//返回一个BOOL值，指明是否允许在按下回车键时结束编辑
}