UITextField小总结

//    1.UITextField的初始化和设置

    textField = [[UITextField alloc] initWithFrame:CGRectMake(120.0f, 80.0f, 150.0f, 30.0f)];

    [textField setBorderStyle:UITextBorderStyleRoundedRect]; //外框类型

    

    textField.placeholder = @"password"; //默认水印提示

    

    textField.secureTextEntry = YES; //设置输入不是明码

//是否纠错

    textField.autocorrectionType = UITextAutocorrectionTypeNo;

//首字母是否大写

    textField.autocapitalizationType = UITextAutocapitalizationTypeNone;

//return键变成什么键

    textField.returnKeyType = UIReturnKeyDone;

//输入框中是否有个叉号，在什么时候显示，用于一次性删除输入框中的内容

    textField.clearButtonMode = UITextFieldViewModeWhileEditing;

//再次编辑就清空

    textField.clearsOnBeginEditing = YES;

//设置为YES时文本会自动缩小以适应文本窗口大小.默认是保持原来大小,而让长文本滚动

    textField.adjustsFontSizeToFitWidth = YES;

//设置自动缩小显示的最小字体大小

    textField.minimumFontSize = 20;

    

//设置键盘的样式

    textField.keyboardType = UIKeyboardTypeNumberPad;

    textField.delegate = self;

    

    UIImageView *imgv=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"right.png"]];

    textField.rightView=imgv;//右侧图片

    textField.rightViewMode = UITextFieldViewModeAlways;

    

    textField.leftView=imgv;//左侧图片

    textField.leftViewMode = UITextFieldViewModeAlways;

    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;//垂直居中

//2.要实现的UITextFieldDelegate方法,回收键盘

- (BOOL)textFieldShouldReturn:(UITextField *)textField

{

    [textField resignFirstResponder];

    return YES;

}

//开始编辑时触发，文本字段将成为first responder

- (void)textFieldDidBeginEditing:(UITextField *)textField{

}

//限制长度。字符

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{

    NSCharacterSet *cs;

    NSString *str = @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

//    限制输入英文和数字

    cs = [[NSCharacterSet characterSetWithCharactersInString: @"0123456789\n"]invertedSet];//输入数字和换行(注意这个\n，如果不写这个，Done按键将不会触发，如果用在SearchBar中，将会不触发Search事件，因为你自己限制不让输入\n)

    

    NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs]componentsJoinedByString:@""];

    

    BOOL canChange = [string isEqualToString:filtered];

    

    return canChange;

}