"iOS Development Learning-Lesson three" Uitextfield use

Initialize TextField and set location and size

  Uitextfield *text = [[[Uitextfield Alloc]initwithframe:cgrectmake]];   //set border style, Border style is only displayed if set    Text.borderstyle = uitextborderstyleroundedrect;  typedef enum {     uitextborderstylenone,      uitextborderstyleline,     Uitextborderstylebezel,      Uitextborderstyleroundedrect    } uitextborderstyle; //set the background color of the input box, at which time it is set to white   If you use a custom background picture border will be ignored   Text.backgroundcolor = [Uicolor whitecolor];   //set Background    Text.background = [UIImage imagenamed:@ "Dd.png"];   //set background     Text.disabledbackground = [UIImage imagenamed:@ "Cc.png"]; //when the input box does not have content, the watermark hint   tip content is password   Text.placeholder = @ "password";    //sets the font style and size of the input box contents    Text.font = [Uifont fontwithname:@] Arial "size:20.0f];   //set font color    text.textcolor = [Uicolor redcolor];   //If there is a fork in the input box, when it is displayed, to delete the contents of the input box at once    Text.clearbuttonmode = uitextfieldviewmodealways;    typedef enum {     Uitextfieldviewmodenever, heavy non-appearing      uitextfieldviewmodewhileediting,       uitextfieldviewmodeunlessediting when editing, except for editing, it appears       Uitextfieldviewmodealways always appears  } uitextfieldviewmode;   //the input box starts with the text     Text.text = @ "The text of the input box at the beginning";    //every character you enter into points   Password input    text.securetextentry = YES ;    //Error correction    Text.autocorrectiontype = uitextautocorrectiontypeno;    typedef enum {     uitextautocorrectiontypedefault,  default      Uitextautocorrectiontypeno, no automatic error correction      Uitextautocorrectiontypeyes, automatic error correction  } uitextautocorrectiontype;   //re-edit to clear    text.clearsonbeginediting = yes;     //Content Alignment    text.textalignment = Vertical alignment of uitextalignmentleft;   //content   Uitextfield inherit from Uicontrol, There is an attribute in this class contentverticalalignment   text.contentverticalalignment = When uicontrolcontentverticalalignmentcenter;   //is set to Yes, the text automatically shrinks to fit the text window size. The default is to keep the original size and let long text scroll     Textfied.adjustsfontsizetofitwidth = yes;   //Set the minimum font size for automatic zoom out    Text.minimumfontsize = 20;   //Set the keyboard style    text.keyboardtype = Uikeyboardtypenumberpad;    typedef enum {     Uikeyboardtypedefault,     default keyboard, all characters supported               uikeyboardtypeasciicapable, ASCII-enabled default keyboard      Uikeyboardtypenumbersandpunctuation, standard telephone keypad, support +*# characters      uikeyboardtypeurl,            URL keypad, support for. com buttons   only URL characters  UIKeyboardTypeNumberPad,            Numeric keypad  uikeyboardtypephonepad, telephone keypad      UIKEYBOARDTYPENAMEPHonepad, telephone keypad, also supports input person name  uikeyboardtypeemailaddress, keyboard        for entering electronic   e-mail addresses 　Uikeyboardtypedecimalpad,   numeric keypad   with numbers and decimal points      uikeyboardtypetwitter,      Optimized keypad for easy input @, #字符      Uikeyboardtypealphabet = uikeyboardtypeasciicapable,  } uikeyboardtype    //First Letter Capital    Text.autocapitalizationtype = uitextautocapitalizationtypenone;    typedef enum {     uitextautocapitalizationtypenone,  not automatically capitalized      Uitextautocapitalizationtypewords, capitalize the first letter of the word      uitextautocapitalizationtypesentences, capitalize the first letter of the sentence      uitextautocapitalizationtypeallcharacters,  All letters are capitalized  } Uitextautocapitalizationtype;    //return key into what key   text.returnkeytype =uireturnkeydone;   typedef enum { 　     uireturnkeydefault,  Default   Gray button, labeled return     uireturnkeygo,   Blue button labeled Go      uireturnkeygoogle, blue button labeled Google, search      uireturnkeyjoin, blue button labeled Join      Uireturnkeynext, blue button with next      Uireturnkeyroute, blue button labeled Route      Uireturnkeysearch, blue button labeled Search      uireturnkeysend, blue button labeled Send      Uireturnkeyyahoo , blue button labeled Yahoo      Uireturnkeyyahoo, blue button labeled Yahoo      uireturnkeyemergencycall,  Emergency call button  } uireturnkeytype;   //keyboard Appearance  textview.keyboardappearance= Uikeyboardappearancedefault; typedef enum { uikeyboardappearancedefault,  default appearance, light grey   Uikeyboardappearancealert, dark grey   graphite    } uireturnkeytype;     //set Agent   for implementing protocol    Text.delegate = self;   //Adding TextField to the view    [Self.window addsubview:text];   //The rightmost picture is the following code   similar to the left      Uiimageview *image=[[uiimageview Alloc] Initwithimage:[uiImage imagenamed:@ "Right.png"]];     text.rightview=image;     Text.rightviewmode = uitextfieldviewmodealways;    typedef enum {     Uitextfieldviewmodenever,      uitextfieldviewmodewhileediting,     uitextfieldviewmodeunlessediting,      UITEXTFIELDVIEWMODEALWAYS } uitextfieldviewmode;     //Press RETURN key to go down　  becomefirstresponder    class to adopt uitextfielddelegate protocol    text.delegate = self; Declare the text of the agent is me, I will go to achieve the keyboard down the method   This method in uitextfielddelegate so we have to adopt uitextfielddelegate this protocol    -( BOOL) Textfieldshouldreturn: (Uitextfield *) textfield {     [Text resignfirstresponder];   //main [receiver Resignfirstresponder] where to call the receiver corresponding to the keyboard down  

return yes; 

}      rewrite the paint behavior  , in addition to Uitextfield object style options, you can also customize the Uitextfield object, add many different rewrite methods for him, To change the display behavior of the text field. All of these methods return a CGRECT structure that has a boundary range for each part of the text field. The following methods can be overridden.    – textrectforbounds:  //rewrite to reset text area  – drawtextinrect:      // Changes the emoji property. Calling super When overridden can be drawn by default drawing properties, and you don't have to call super if you completely override the drawing function.  – placeholderrectforbounds://Override to reset placeholder area   – drawplaceholderinrect://Override to change the draw placeholder property. When overridden, calling super can be drawn by default drawing properties, and you don't have to call super if you completely override the drawing function . –  Borderrectforbounds://Override to reset Edge area  – editingrectforbounds://Override to reset edit area  –  Clearbuttonrectforbounds://Rewrite to reset the Clearbutton position, changing the size may cause the picture of the button to be distorted  – leftviewrectforbounds: –  rightViewRectForBounds:    Delegate Method    -  (BOOL) textfieldshouldbeginediting :(uitextfield *) textfield{ //Returns a bool value specifying whether the sequential text field starts editing      return yes;  }     -  (void) textfielddidbeginediting: (uitextfield *) TextField{  //is triggered when editing starts, the text field becomes First responder  }    -  (BOOL) Textfieldshouldendediting: (uitextfield *) textfield{ //Returns a bool value that specifies whether the text field is allowed to end editing, and when the edit is finished, the text field will yield first　 responder    //To prevent a text field from disappearing when the user finishes editing, you can return no    //This is useful for programs that must remain active for some text fields, such as instant messaging  　      return no;  }    -  (BOOL) TextField: (uitextfield*) Textfield shouldchangecharactersinrange: (　Nsrange) Range replacementstring: (nsstring *) string{ //This method is called when the user uses the AutoCorrect feature to modify the input text to the recommended text.　　 //This is especially useful for applications that want to join the Undo option  //can track the last modification made in a field, or log records of all edits for auditing purposes.   //to prevent text from being changed you can return no  //the method has a Nsrange object in the parameter, indicating the position of the changed text, and the suggested text is also in it       return　 YES;  }    -  (BOOL) Textfieldshouldclear: (uitextfield *) textfield{   //　Returns a bool value indicating whether to allow content to be purged based on user request  //can be set under certain conditions to allow clear content       return yes;  }    -(BOOL) Textfieldshouldreturn: (uitextfield *) textfield{   //Returns a BOOL value indicating whether the edit is allowed to end when the ENTER key is pressed   //If you allow the resignfirstresponder  method to be called, this causes the end of the edit, and the keyboard is closed [textfield resignfirstresponder]; 　Check out the meaning of the word resign to understand this method     return yes;  }         notification  uitextfield is derived from Uicontrol, so the notification system in the Uicontrol class is also available in the Text field. In addition to the standard events of the Uicontrol class, you can also use the following Uitextfield class-specific events    UITextFieldTextDidBeginEditingNotification  uitextfieldtextdidchangenotification uitextfieldtextdidendeditingnotification  triggered when the text field exits edit mode. The object property of the notification stores the final text.     because text fields use the keyboard to enter text, action notifications are also sent when the following events occur    uikeyboardwillshownotification// Keyboard display before sending  UIKeyboardDidShowNotification //keyboard display after sending  uikeyboardwillhidenotification//keyboard hidden before sending  UIKeyboardDidHideNotification //keyboard is hidden after sending  1, text : Sets the default text for the text box.  2, placeholder :  can display gray words in a text box to indicate what the user should enter in the text box. When the data is entered in this text box, the gray word used for the hint will automatically disappear.  3, background : 4, disabled :  If this is selected, the user will not be able to change the contents of the text box.  5, followed by three buttons, is used to set the alignment.  6, Border style :  Select the border style.  7, clear button :  This is a drop-down menu, you can choose to clear when the button appears, the so-called clear button is out of a text box now to the right of the small  x&nbsp, you can have the following options:      7.1 never appears :  never appear      7.2 appears while editing :  when editing occurs  & nbsp   7.3 appears unless editing :      7.4 are always visible :  visible  8, Clear When editing begins :  is selected, the previous content in the text box is cleared when you start editing the text box. For example, you are now in this text box  A  entered   "What" &nbsp, and then to edit the text box  b, if you come back to edit the text box  a&nbsp, then the   "what"   will be cleared immediately.  9, text color :  sets the color of the text in the text box.  10, font :  sets the font and font size of the text.  11, min font size :  set the minimum font that the text box can display (but I don't feel It)  12, Adjust to fit :  specifies that when the size of the text box is reduced, Whether the text in the text box also shrinks. Select it to make all text visible, even if the text is long. However, this option should be used in conjunction with  min font size , and the text will not be smaller than the set  min font size .   The next partTo set how the keyboard is displayed.  13, captitalization :  set uppercase. There are four options in the drop-down menu:     13.1 none :  do not set caps      13.2 words :  capitalize each word first letter, The words here refer to strings separated by spaces      13.3 sentances :  The first letter of each sentence, where the sentence is a string separated by a period and a space      13.4 All characters :  so the letter capitalization  14, correction :  check spelling, default is  YES .  15, keyboard :  Select keyboard types, such as full numbers, letters, and numbers.  16, appearance: 17, return key :  Select the Return key, you can select  Search ,  Return ,  done   and so on.  18, auto-enable return key :  If selected, the keyboard's return key is valid only if at least one character is entered in the text box.  19, secure :  When your text box is used as a password input box, you can select this option, at which point the characters are displayed as asterisks.　   1.alignment horizontal  Horizontal Alignment  2.alignment vertical  vertical alignment  3. Used to return a bool value Whether the input box is  selected (checked) Enabled (available) highlighted (highlight)     limit only enter specific characters     (BOOL) TextField: (Uitextfield *) TextField Shouldchangecharactersinrange: (nsrange) Range replacementstring: (Nsstring *) string{     Nscharacterset *cs;     cs = [[Nscharacterset charactersetwithcharactersinstring:numbers]invertedset];       NSString *filtered = [[ String componentsseparatedbycharactersinset:cs]componentsjoinedbystring:@ ""]; //groups separated by CS, array separated by @ ""        BOOL canchange = [string isequaltostring:filtered];       Return canchange; }    above that NUMBERS is a macro that can be defined at the top of the file:  #define NUMBERS @ "0123456789n"   (This delegate can enter a number and line break, please note that this n, if you do not write this, the Done button will not be triggered, if used in Searchbar, will not trigger the search event, because you have to restrict the input n, very miserable, I found in the project.   So, if you want to restrict the input of English and numbers, you can define this as:  #define Kalphanum   @ " Abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789″.   Of course, you can also do a hint before the above method return, such as prompting the user to enter only numbers and the like. If you feel the need.     restrict the input of characters    -(BOOL) TextField: (Uitextfield *) to a certain length TextField Shouldchangecharactersinrange: (nsrange) Range replacementstring: (NSString *) STRING;&Nbsp; {//string is the character that is entered at this time  textfield is the input box that is being entered at this time   returns Yes to change the value of the input box  no reverse      if ([string isequaltostring:@ "n"])//press passing to change      {          return yes;& nbsp;    }        NSString * tobestring = [Textfield.text Stringbyreplacingcharactersinrange:range withstring:string]; //Get the contents of the input box        if ( Self.mytextfield = = TextField)//Determine if we want to limit the input box      {          if ([ Tobestring Length] > { //If the input box content is greater than 20 pop-up warning    textfield.text = [tobestring substringtoindex:20];& nbsp;             Uialertview *alert = [[Uialertview alloc] Initwithtitle:nil message: @ "More than the maximum number of words can not be entered" Delegate:nil cancelbuttontitle:@ "OK" otherbuttontitles:nil, nil] autorelease];              [alert show];             return no;         }     }      RET Urn yes;  }

iOS Development Learning-lesson three Uitextfield using