iOS设置textView的placeholder

转载：http://blog.sina.com.cn/s/blog_7a1b23430102wkys.html

#import "ViewController.h"

@interface ViewController ()<</span>UITextViewDelegate>

{

UILabel *textViewPlaceholderLabel;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

1、在UITextView上加上一个UILabel

textViewPlaceholderLabel = [[UILabel alloc] initWithFrame:CGRectMake(53, 202, 150, 25)];

textViewPlaceholderLabel.text = @"请输入你的内容";

textViewPlaceholderLabel.textColor = [UIColor grayColor];

UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(50, 200, 150, 250)];

textView.delegate = self;

textView.backgroundColor = [UIColor clearColor];

textView.layer.borderWidth = 1.0f;

textView.layer.borderColor = [UIColor blackColor].CGColor;

[self.view addSubview: textViewPlaceholderLabel];

[self.view addSubview: textView];

}

//设置textView的placeholder

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

{

//[text isEqualToString:@""] 表示输入的是退格键

if (![text isEqualToString:@""])

{

textViewPlaceholderLabel.hidden = YES;

}

//range.location == 0 && range.length == 1 表示输入的是第一个字符

if ([text isEqualToString:@""] && range.location == 0 && range.length == 1)

{

textViewPlaceholderLabel.hidden = NO;

}

return YES;

}