UITextField，UITextView ，UILabel，键盘，UIFont

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来自：http://blog.csdn.net/andyweike/article/details/6746300

1.UITextView 也称作智能标签。

(1). -[UITextView setContentToHTMLString:] 可以设置html内容，但是这是个私有api的函数。

显示大段文本首选UITextView，不是UILabel。

(2).通过设置inputAccessoryView，增加一行工具栏来关闭键盘

{
    UIToolbar* inputAccessoryView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];
    [inputAccessoryView setBarStyle:UIBarStyleBlack];
    UIBarButtonItem* spaceButton = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil] autorelease];
    UIBarButtonItem* doneButton = [[[UIBarButtonItem alloc] initWithTitle:@"完成输入" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)] autorelease];
    NSArray * buttonsArray = [NSArray arrayWithObjects:spaceButton,doneButton,nil];
    [inputAccessoryView setItems:buttonsArray];
    [textView setInputAccessoryView:inputAccessoryView];
}
-(void)dismissKeyBoard
{
    [textView resignFirstResponder];

}

(3)最完美的带下划线的多行输入

http://115.com/file/dpko1yxw#LinedTextView.zip //对ios7支持不好了

http://code4app.com/ios/Note-View/511358c26803fadc70000000

(4).限制输入长度

static const int KMaxTextLength=280;

#pragma mark -
#pragma mark UITextViewDelegate

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
   NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
   int length=[textView.text lengthOfBytesUsingEncoding:enc];
   int addLength=[text lengthOfBytesUsingEncoding:enc];

   if(length>= KMaxTextLength && addLength>0 || length+addLength>KMaxTextLength)
   {
       return NO;
   }

   return YES;
}

- (void)textViewDidChange:(UITextView *)textView
{
   NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
   int length=[textView.text lengthOfBytesUsingEncoding:enc];
   iCountLabel.text=[NSString stringWithFormat:@"%d",length];
}

(5).取得UITextView中的光标所在位置

http://blog.csdn.net/liyanbo1984/article/details/5807095

2.UITextField实现了UITextInput协议，UITextInput协议实现了UIKeyInput协议，UIKeyInput协议实现了UITextInputTraits协议，该协议提供了7个属性：文本自动大写样式等。

(1) UITextField 部分属性：

placeholder：占位符提示；默认使用70%灰色，UITextView没有placeholder属性。

borderStyle：输入框边框样式；

clearButtonMode：UITextFieldViewModeWhileEditing 在输入框右侧显示圆形叉号，用以清除内容。它会被rightView覆盖。

inputView：替换掉标准键盘

UIReturnKeyType returnKeyType： // default is UIReturnKeyDefault (See note under UIReturnKeyType enum)

autocapitalizationType=UITextAutocapitalizationTypeNone;//去掉首字母大写，autocapitalizationType默认是UITextAutocapitalizationTypeSentences

contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;//文字重直居中

(2) 设置 leftView，rifghtView 示例

[html] view plaincopy

textField.leftViewMode = UITextFieldViewModeAlways;
textField.rightViewMode = UITextFieldViewModeAlways;
UILabel* label1=[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 30, 20)];
label1.text=@"left";
label1.textAlignment=UITextAlignmentLeft;
textField.leftView=label1;
[label1 release];
label1=[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 40, 20)];
label1.text=@"right";
label1.textAlignment=UITextAlignmentRight;
textField.rightView=label1;
[label1 release];

更多UITextField 属性讲解

http://blog.csdn.net/jinglijun/article/details/7058632

http://www.uplook.cn/index-Index-show-view17944.html

http://unmi.cc/uilable-uitextfield-padding-insets

iOS中UITextField 使用全面解析

http://my.oschina.net/u/936286/blog/131010

5. UITextFieldDelegate中

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string; 用来过滤输入的内容。

这是逐字运行的，每次点击键盘后调用该方法。

可以使用以下句法过滤：

NSString *filtered = [[string componentsSeparatedByCharactersInSet:characterSet] componentsJoinedByString:@""];
BOOL basicTest = [string isEqualToString:filtered];

NSPredicate........

只有在UITextView处在isFirstResponder时，才会触发UITextViewDelegate- (void)textViewDidChange:(UITextView *)textView

6.通用方法解决UITextFiled输入的时候，键盘遮挡问题

http://blog.csdn.net/favormm/article/details/6799942

iPhone竖屏时键盘高216，弹出时间0.3s。

iPad 高度264 352 318 406 54中文行高

ios5动态获取键盘高度 216，252两个高度。UIKeyboardWillChangeFrameNotification通知并不能按照所想的那样发生，要注意以下几点：

a.当在英文和中文输入法之间切换时，iPhone中并不会产生UIKeyboardWillChangeFrameNotification和UIKeyboardDidChangeFrameNotification通知，而iPad中会产生；
b.ChangeFrame Notification会发生在Show或Hide Notification之前；
c.在iPad中分割键盘会有Hide Notification，合并键盘时才有Show Notification。分割时键盘竟然是隐藏的;

参考 http://xcodev.com/wordpress/?p=410

-(void) keyboardDidShow: (NSNotification *)notif
{
   NSDictionary* userInfo = [notif userInfo];
   NSValue* value = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
   float keyBoardHeight=[value CGRectValue].size.height;//高216 keyBoardHeight=252;

   //value = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    //NSTimeInterval animationDuration;
    //[value getValue:&animationDuration];
}

9. 在info.plist中，添加Localizations：Chinese，设置长按输入框出现的功能层为中文（拷贝等）。

10.UILabel

(1) //阴影

label.shadowColor = [UIColor colorWithWhite:0.0f alpha:0.75f];
label.shadowOffset = CGSizeMake(0.0f, -2.0f);

另一个笨方法：定义两个UILabel 叠加,底层的UILabel文字为阴影的半透明效果,上层的UILabel和下层的UILabel偏移一个像素并且背景透明,也能起到阴影效果。

//单行，超长省略

label_.lineBreakMode=UILineBreakModeTailTruncation;
label_.numberOfLines=1;

(2)同一个UILabel内能显示多种颜色的文字

three20
http://github.com/facebook/three20/

FontLabel
http://github.com/zynga/FontLabel/

http://www.cocoachina.com/bbs/simple/?t14541.html

13.自定义placeholder

继承UITextField，重写drawPlaceholderInRect：

- (void)drawPlaceholderInRect:(CGRect)rect

{
    // Set colour and font size of placeholder text
    [color(0xc4,0xc4,0xc4) setFill];
    [[self placeholder] drawInRect:rect withFont:[Utility fontWithSize:12]];
}

16.切换输入法

   UITextInputMode类是在4.2及之后才有的一个新类，用来获取当前文本输入模式。即在用户输入文本时，判断使用的是什么键盘。
在改变输入方式时，获得此值，如下：
注册通知：
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardChangeMode:) name:UITextInputCurrentInputModeDidChangeNotification object:nil];
-(void) keyboardChangeMode:(NSNotification *)notification
{
   NSLog(@"keyboardChangeMode:%@",[[UITextInputMode currentInputMode] primaryLanguage]);
}

en-US    //英文
zh-Hans //中文简体
zh-Hant //中文繁体

或者不注册通知，随时使用也可以：NSLog(@"currentInputMode:%@",[[UITextInputMode currentInputMode] primaryLanguage]);

http://blog.sina.com.cn/s/blog_69081e060100v7ad.html

17.使用增加的initWithFrame..开头的类别创建的textField，显示出来的UITextField响应不了键盘事件。所以，要采用静态方法的方式封装构造函数。

18.
   NSArray *familyNames = [UIFont familyNames];
   for( NSString *familyName in familyNames )
   {
       printf( "Family: %s \n", [familyName UTF8String] );
       NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName];
       for( NSString *fontName in fontNames )
       {
           printf( "\tFont: %s \n", [fontName UTF8String] );
       }
   }

http://www.cocoachina.com/bbs/simple/?t70231.html

http://www.cnblogs.com/tracy-e/archive/2010/11/04/1869250.html

19.UITextField 切换密码明文形式

        iPasswordTextField.secureTextEntry=YES;
        UIButton* eyeButton=[UIButton buttonWithOrigin:CGPointMake(0, 0) normalImage:[UIImage imageNamed:@"eye.png"] hightlightedImage:nil selectedImage:nil];
        [eyeButton addTarget:self action:@selector(showOrHidePassword) forControlEvents:UIControlEventTouchUpInside];
        iPasswordTextField.rightView=eyeButton;
        iPasswordTextField.rightViewMode = UITextFieldViewModeAlways;
        iPasswordTextField.clearButtonMode=UITextFieldViewModeNever;

-(void)showOrHidePassword
{
    [iPasswordTextField resignFirstResponder];//如果不先失去焦点，设置不成功。

    BOOL isSecureTextEntry=iPasswordTextField.isSecureTextEntry;
    [iPasswordTextField setSecureTextEntry:!isSecureTextEntry];
}

20.// drawing and positioning overrides
重写下面一些方法，可以实现一些需求
- (CGRect)borderRectForBounds:(CGRect)bounds;
- (CGRect)textRectForBounds:(CGRect)bounds;
- (CGRect)placeholderRectForBounds:(CGRect)bounds;
- (CGRect)editingRectForBounds:(CGRect)bounds;
- (CGRect)clearButtonRectForBounds:(CGRect)bounds;
- (CGRect)leftViewRectForBounds:(CGRect)bounds;
- (CGRect)rightViewRectForBounds:(CGRect)bounds;

- (void)drawTextInRect:(CGRect)rect;
- (void)drawPlaceholderInRect:(CGRect)rect;

21.不能无缘无故强制显示虚拟键盘，可以制造一个假的看不见的UITextField，然后

[objc] view plaincopy

[self.view addSubView:textField];
[textField becomeFirstResponser];

22.

iOS 7系列译文：认识 TextKit

http://www.cocoachina.com/applenews/devnews/2013/1126/7417.html

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