【代码笔记】iOS-UIView的placeholder的效果

一,效果图。

【代码笔记】iOS-UIView的placeholder的效果

二,工程图。

【代码笔记】iOS-UIView的placeholder的效果

三,代码。

RootViewController.h

【代码笔记】iOS-UIView的placeholder的效果
#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController
<UITextViewDelegate>
{
UITextView *psTextView;
UILabel *pslabel;
}
@end
【代码笔记】iOS-UIView的placeholder的效果

RootViewController.m

【代码笔记】iOS-UIView的placeholder的效果
#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
} - (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view. self.title=@"UIView的placeholder的效果"; [self initBackgroundView]; }
#pragma -mark -初始化背景图
-(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=@"请输入备注信息";
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)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{ if (text.length>0) {
pslabel.hidden=YES;
} if ([text isEqualToString:@"\n"]) {
[textView resignFirstResponder];
return NO;
} return YES;
}
【代码笔记】iOS-UIView的placeholder的效果
 
 
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