IOS settings TextView with placeholder text

Native TextView no placeholder text, can be DrawRect: method to add placeholder text, the specific settings are as follows:

1. Get the current placeholder Text property:

// Text Properties Nsmutabledictionary *attrs =//  Gets the Text property of the current Placeholdertextview attrs[ Nsforegroundcolorattributename] = Self.placeholdercolor? Self.placeholdercolor: [Uicolor Lightgraycolor];

2. Set the drawing range (including text margins):

//Drawing RangeCGFloat placeholdertopmargin = Self.placeholdertopmargin?Self.placeholderTopMargin:kPlaceholderDefaultTopMargin; CGFloat Placeholderleftmargin= Self.placeholderleftmargin?Self.placeholderLeftMargin:kPlaceholderDefaultTopMargin; CGFloat Placeholderx=Placeholdertopmargin; CGFloat Placeholdery=Placeholderleftmargin; CGFloat Placeholderw= Rect.size.width-2*Placeholderleftmargin; CGFloat Placeholderh= Rect.size.height-2*Placeholdertopmargin; CGRect Placeholderrect=CGRectMake (Placeholderx, Placeholdery, Placeholderw, Placeholderh); [Self.placeholder drawinrect:placeholderrect withattributes:attrs];

3. By notification or agent, when the TextView text changes, redraw:

// set up notifications to send to yourself when TextView text changes object: Self];

Notification events:

-(void) textdidchanged{    //  redraw     [self setneedsdisplay];}

4. Override the TextView property method to draw in real time:

-(void) Setplaceholder: (NSString *) placeholder{    = [placeholder copy];         // will call DrawRect in the next message loop     [self setneedsdisplay];}

-(void) Setplaceholdercolor: (Uicolor *) placeholdercolor{    = placeholdercolor;        [Self setneedsdisplay];}

-(void) SetText: (NSString *) text{    //  system comes with properties         [self setneedsdisplay] ;}

-(void) Setattributedtext: (nsattributedstring *) attributedtext{    [Super Setattributedtext: Attributedtext];        [Self setneedsdisplay];}

-(void) SetFont: (Uifont *) font{    [Super Setfont:font];        [Self setneedsdisplay];}

Githubs:https://github.com/bigplane/chplaceholdertextview

IOS settings TextView with placeholder text