The IOS UI tutorial sets UITextField properties

  • 2020-05-27 07:16:20
  • OfStack

UITextField is a very common control in IOS, which is used to receive user input information and complete the interaction between application and user. Its main properties are set as follows:

// Initialize the textfield And set the location and size 
 UITextField *text = [[UITextField alloc]initWithFrame:CGRectMake(20, 20, 130, 30)];
// Set the border style. The border style will not be displayed until it is set  
 text.borderStyle = UITextBorderStyleRoundedRect;

 typedef enum {
 } UITextBorderStyle;
// Set the background color of the input box to white   Custom background image borders are ignored if used  
 text.backgroundColor = [UIColor whiteColor];
// Set the background 
 text.background = [UIImage imageNamed:@"dd.png"];
// Set the background  
 text.disabledBackground = [UIImage imageNamed:@"cc.png"];

// When there is no content in the input box, the watermark is prompted   The prompt content is password
 text.placeholder = @"password";
// Sets the font style and size of the input box content 
 text.font = [UIFont fontWithName:@"Arial" size:20.0f];
// Set font color 
 text.textColor = [UIColor redColor];
// Is there a cross in the input box and when is it displayed for 1 Subclassically deletes the contents of the input box 
 text.clearButtonMode = UITextFieldViewModeAlways;
typedef enum {
 UITextFieldViewModeNever,  Weight does not appear 
 UITextFieldViewModeWhileEditing,  Appear while editing 
 UITextFieldViewModeUnlessEditing,  All except the editors 
 UITextFieldViewModeAlways 1 Straight a 
} UITextFieldViewMode;
// In the input box 1 The text was there from the beginning 
 text.text = @"1 Start with the text in the input box ";
// Each input 1 The number of characters becomes a dot   Password entry 
 text.secureTextEntry = YES;
// Whether the error correction 
 text.autocorrectionType = UITextAutocorrectionTypeNo;
typedef enum {
 UITextAutocorrectionTypeDefault,  The default 
 UITextAutocorrectionTypeNo,  No automatic error correction 
 UITextAutocorrectionTypeYes,  Automatic error correction 
} UITextAutocorrectionType;
// Edit again and clear 
 text.clearsOnBeginEditing = YES; 
// Content alignment 
 text.textAlignment = UITextAlignmentLeft;
// Vertical alignment of content  UITextField Inherited from UIControl, In such a 1 A property contentVerticalAlignment
 text.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
// Set to YES The text will automatically shrink to fit the text window size . The default is to keep the original size , And let the long text scroll  
 textFied.adjustsFontSizeToFitWidth = YES;
// Set the minimum font size to automatically shrink the display 
 text.minimumFontSize = 20;
// Set the style of the keyboard 
 text.keyboardType = UIKeyboardTypeNumberPad;
typedef enum {
 UIKeyboardTypeDefault,   Default keyboard, all characters supported    
 UIKeyboardTypeASCIICapable,  support ASCII Default keyboard 
 UIKeyboardTypeNumbersAndPunctuation,  Standard phone keypad, support + * # character 
 UIKeyboardTypeURL,   URL Keyboard, support .com button   Only support URL character 
UIKeyboardTypeNumberPad,     The keypad 
UIKeyboardTypePhonePad,   The phone keyboard 
 UIKeyboardTypeNamePhonePad,  Phone keypad, also supports entering a person's name 
UIKeyboardTypeEmailAddress,  For the input of electrons   Email address keyboard   
UIKeyboardTypeDecimalPad,   The keypad   There are Numbers and decimals 
 UIKeyboardTypeTwitter,   Optimized keyboard for easy input @ , # character 
 UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable, 
} UIKeyboardType;
// Whether the first letter is capitalized 
 text.autocapitalizationType = UITextAutocapitalizationTypeNone;
typedef enum {
 UITextAutocapitalizationTypeNone,  Not automatically capitalized 
 UITextAutocapitalizationTypeWords,  The first letter of a word is capitalized 
 UITextAutocapitalizationTypeSentences,  The first letter of a sentence is capitalized 
 UITextAutocapitalizationTypeAllCharacters,  All letters are capitalized 
} UITextAutocapitalizationType;
//return What does the bond become 
 text.returnKeyType =UIReturnKeyDone;
typedef enum {
 UIReturnKeyDefault,  The default   Grey button, labeled Return
 UIReturnKeyGo,   marked Go Blue button 
 marked Google The blue button, terms search 
 marked Join Blue button 
 marked Next Blue button 
 marked Route Blue button 
 marked Search Blue button 
 marked Send Blue button 
 marked Yahoo Blue button 
 marked Yahoo Blue button 
 UIReturnKeyEmergencyCall,  Emergency call button 
} UIReturnKeyType;
// Keyboard appearance 
textView.keyboardAppearance=UIKeyboardAppearanceDefault ; 
typedef enum {
UIKeyboardAppearanceDefault .   Default appearance, light grey 
UIKeyboardAppearanceAlert .    Dark grey   Graphite color 
} UIReturnKeyType;

// Set the agent   Used to implement protocols 
 text.delegate = self;
// the textfield Add to view 
 [self.window addSubview:text];
// The image on the far right is the following code   On the left side of the similar 
 UIImageView *image=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"right.png"]];
 text.rightViewMode = UITextFieldViewModeAlways; 
typedef enum {
} UITextFieldViewMode;

// According to the return Key the keyboard down  becomeFirstResponder
 Class to adopt UITextFieldDelegate agreement 
text.delegate = self;  The statement text The agent is me, I will implement the keyboard down the method   This method is UITextFieldDelegate So we're going to use UITextFieldDelegate This agreement 
- (BOOL)textFieldShouldReturn:(UITextField *)textField
 [text resignFirstResponder]; // mainly [receiver resignFirstResponder] Where can I call it receiver The corresponding keyboard is pulled down 
 return YES;

 Overwrite drawing behavior 
 In addition to UITextField You can also customize the style options of the object UITextField Object for which a number of different override methods are added to change the display behavior of a text field. These methods all return 1 a CGRect Structure that specifies the bounds of each part of the text field. The following methods can be overridden. 
 �  textRectForBounds:   // Rewrite to reset the text area 
 �  drawTextInRect:    
// Change the emoji property . Overwrite call super You can draw by default graphic properties , If you completely override the draw function yourself, you don't need to call it super the .
 �  placeholderRectForBounds:  
// Override to reset the placeholder area 
 �  drawPlaceholderInRect:  
// Overrides the draw placeholder property . Overwrite call super You can draw by default graphic properties , If you completely override the draw function yourself, you don't need to call it super the .
 �  borderRectForBounds:  
// Override to reset the edge area 
 �  editingRectForBounds:  
// Override to reset the edit area 
 �  clearButtonRectForBounds:  
// Rewrite to reset clearButton location , change size May lead to button Picture distortion 
 �  leftViewRectForBounds:
 �  rightViewRectForBounds:
 The delegate 
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{ 
// return 1 a BOOL Value, specifying whether to start editing in sequence from the text field  
 return YES; 
- (void)textFieldDidBeginEditing:(UITextField *)textField{ 

 // When triggered to start editing, the text field will become first responder 
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{ 

// return BOOL Value that specifies whether the text field is allowed to close the edit. When the edit is finished, the text field is let go first responder 
// To prevent the text field from disappearing when the user finishes editing, return NO 
// the 1 Applications where text fields must always be active, such as instant messaging, are useful  
 return NO; 
- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{ 

// This method is called when the user USES autocorrect to change the input text to the recommended text.  
// This is especially useful for applications that want to add the undo option  
// You can track what is done in the field at the end 1 You can also log all edits , For audit purposes.   
// To prevent text from being changed you can return NO 
// The parameters of this method are 1 a NSRange Object that indicates the location of the changed text, including the suggested modified text  
  return YES; 
- (BOOL)textFieldShouldClear:(UITextField *)textField{ 
// return 1 a BOOL The value indicates whether content is allowed to be purged upon user request  
// You can set certain conditions to allow content to be cleared  
  return YES; 
-(BOOL)textFieldShouldReturn:(UITextField *)textField{ 
// return 1 a BOOL Value indicating whether the edit is allowed to end when the enter key is pressed  
// If allowed to call resignFirstResponder  Method, which causes the edit to end and the keyboard to be retracted [textField resignFirstResponder];
// check 1 Under the resign The meaning of the word is clear  

  return YES; 

The above is the entire content of this article, I hope to help you learn IOS programming.

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