Placeholder of iphone custom UITextView

We all know that UITextField has the placeholder attribute, and UITextView does not have placeholder. How can we simulate UITextfield to make UITextView have placeholder. The idea is: Inherit the uitextview and make [super text] display placeholder when the text is null. The Code is as follows (I referenced arc): UIPlaceholderTextView. h

# Import <UIKit/UIKit. h> @ interface UIPlaceholderTextView: UITextView @ property (nonatomic, strong) NSString * placeholder; // placeholder-(void) addObserver; // Add notification-(void) removeobserver; // remove notification @ end # import <UIKit/UIKit. h> @ interface UIPlaceholderTextView: UITextView @ property (nonatomic, strong) NSString * placeholder; // placeholder-(void) addObserver; // Add notification-(void) removeobserver; // remove notification @ endUIPlaceholderTextView. m

 

# Import "UIPlaceholderTextView. h "@ interface UIPlaceholderTextView () @ property (nonatomic, strong) UIColor * textColor;-(void) beginEditing :( NSNotification *) notification;-(void) endEditing :( NSNotification *) notification; @ end @ implementation UIPlaceholderTextView @ synthesize placeholder; @ synthesize textColor;-(id) initWithFrame :( CGRect) frame {if (self = [super initWithFrame: frame]) {[self awakeFromNib];} return self;} // this method is called when a nib is created-(void) awakeFromNib {textColor = [UIColor redColor]; [self addObserver];}-(void) addObserver {[[nsicationcenter center defacenter center] addObserver: self selector: @ selector (beginEditing :) name: UITextViewTextDidBeginEditingNotification object: self]; [[nsicationcenter center defacenter center] addObserver: self selector: @ selector (endEditing :) name: jsonobject: self];}-(void) removeobserver {[[nsicationicationcenter defacenter center] removeObserver: self] ;}# pragma mark-# pragma mark Setter/Getters-(void) setPlaceholder :( NSString *) aPlaceholder {placeholder = aPlaceholder; [self endEditing: nil];} -(NSString *) text {NSString * text = [super text]; if ([text is1_tostring: placeholder]) return @ ""; return text;}-(void) beginEditing :( NSNotification *) notification {if ([super. text isw.tostring: placeholder]) {super. text = nil; // font color [super setTextColor: textColor] ;}}- (void) endEditing :( NSNotification *) notification {if ([super. text isEqualToString: @ ""] | self. text = nil) {super. text = placeholder; // annotation color [super setTextColor: [UIColor lightGrayColor] ;}# import "UIPlaceholderTextView. h "@ interface UIPlaceholderTextView () @ property (nonatomic, strong) UIColor * textColor;-(void) beginEditing :( NSNotification *) notification;-(void) endEditing :( NSNotification *) notification; @ end @ implementation UIPlaceholderTextView @ synthesize placeholder; @ synthesize textColor;-(id) initWithFrame :( CGRect) frame {if (self = [super initWithFrame: frame]) {[self awakeFromNib];} return self;} // this method is called when a nib is created-(void) awakeFromNib {textColor = [UIColor redColor]; [self addObserver];}-(void) addObserver {[[nsicationcenter center defacenter center] addObserver: self selector: @ selector (beginEditing :) name: UITextViewTextDidBeginEditingNotification object: self]; [[nsicationcenter center defacenter center] addObserver: self selector: @ selector (endEditing :) name: jsonobject: self];}-(void) removeobserver {[[nsicationicationcenter defacenter center] removeObserver: self] ;}# pragma mark-# pragma mark Setter/Getters-(void) setPlaceholder :( NSString *) aPlaceholder {placeholder = aPlaceholder; [self endEditing: nil];} -(NSString *) text {NSString * text = [super text]; if ([text is1_tostring: placeholder]) return @ ""; return text;}-(void) beginEditing :( NSNotification *) notification {if ([super. text isw.tostring: placeholder]) {super. text = nil; // font color [super setTextColor: textColor] ;}}- (void) endEditing :( NSNotification *) notification {if ([super. text isEqualToString: @ ""] | self. text = nil) {super. text = placeholder; // annotation color [super setTextColor: [UIColor lightGrayColor];}

 

When using ViewController, 1. Add a uitextview connection to xib; 2. directly create initframe, but do not forget, placeholder, and add and remove notifications.

-(Void) viewDidLoad {[super viewDidLoad]; self. textView. placeholder = @ "Please add your information ...... "; // Do any additional setup after loading the view, typically from a nib .} -(void) viewDidAppear :( BOOL) animated {[super viewDidAppear: YES]; [self. textView addObserver];}-(void) viewDidDisappear :( BOOL) animated {[super viewDidDisappear: YES]; [self. textView removeobserver];}-(void) viewDidLoad {[super viewDidLoad]; self. textView. placeholder = @ "Please add your information ...... "; // Do any additional setup after loading the view, typically from a nib .} -(void) viewDidAppear :( BOOL) animated {[super viewDidAppear: YES]; [self. textView addObserver];}-(void) viewDidDisappear :( BOOL) animated {[super viewDidDisappear: YES]; [self. textView removeobserver];}

 

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