IOS Code notes UIView's placeholder effect _ios

The example of this article for everyone to share the iOS placeholder results for your reference, the details are as follows

One, the effect chart

Second, engineering drawing

Third, the Code
RootViewController.h

#import <UIKit/UIKit.h>

@interface rootviewcontroller:uiviewcontroller
<UITextViewDelegate>
{
  Uitextview *pstextview;
  Uilabel *pslabel;
}
@end 

Rootviewcontroller.m

#import "RootViewController.h" @interface Rootviewcontroller () @end @implementation Rootviewcontroller-(ID) initwit Hnibname: (NSString *) Nibnameornil Bundle: (NSBundle *) Nibbundleornil {self = [super Initwithnibname:nibnameornil bundle
  : Nibbundleornil];
if (self) {//Custom initialization} return self;
  }-(void) viewdidload {[Super viewdidload];
  
  Do no additional setup after loading the view.
  
  self.title=@ "The effect of UIView placeholder";

[Self initbackgroundview]; #pragma-mark-Initialize background image-(void) Initbackgroundview {uiview *backview=[[uiview alloc]initwithframe:cgrectmake (0, 0, 320,
  480)];
  
  [Self.view Addsubview:backview];
  Pstextview=[[uitextview Alloc]initwithframe:cgrectmake (10, 70, 280, 200)];
  pstextview.text=@ "";
  Pstextview.backgroundcolor=[uicolor Yellowcolor];
  pstextview.delegate=self;
  Pstextview.scrollenabled=no;
  
  
  [Backview Addsubview:pstextview];
  Pslabel=[[uilabel Alloc]initwithframe:cgrectmake (15, 140, 280, 20)]; Pslabel.text=@ "Please enter the memo information";
  Pslabel.textcolor=[uicolor Graycolor];
  Pslabel.enabled=no;
  Pslabel.backgroundcolor=[uicolor Clearcolor];

[Backview Addsubview:pslabel]; #pragma-mark-uitextview Delegate-(BOOL) textviewshouldbeginediting: (Uitextview *) TextView {return YES;}-(bool) TE Xtview: (Uitextview *) TextView Shouldchangetextinrange: (nsrange) Range Replacementtext: (NSString *) text {if (Text.leng
  th>0) {pslabel.hidden=yes;
    } if ([Text isequaltostring:@ "\ n"]) {[TextView resignfirstresponder];
  return NO;
return YES;
 }

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