iOS关于UITextView自定义PlaceHolder
作者:
Z_Lukas | 来源:发表于
2015-12-23 09:49 被阅读221次
- 开发过程中有收获会使用到输入框，但是UITextField又不可以换行，使用UITextView虽然可以换行，但是却没有PlaceHolder，下面介绍如何使用，UITextView中添加一个label默认位是PlaceHolder
#import "ViewController.h"
@interface ViewController ()<UITextViewDelegate>
@property(nonatomic,strong)UILabel *label;
@end
- 在viewDidload方法中创建textview和label
UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(50, 100, 300, 100)];
textView.delegate = self;
textView.layer.borderColor =[UIColor redColor].CGColor;
textView.layer.borderWidth = 1.0;
_label = [[UILabel alloc] initWithFrame:CGRectMake(55, 102, 100, 20)];
_label.text = @"请输入东西";
[self.view addSubview:textView];
[self.view addSubview:self.label];
- 然后再UITextView的delegate里边做相应地逻辑处理
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView{
if ([textView.text isEqualToString:@""]) {
_label.text = @" ";
}else{
_label.text = @"";
}
return YES;
}
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
if ([text isEqualToString:@"\n"]) {
if ([textView.text isEqualToString:@""] ||textView.text== nil) {
_label.text = @"请输入东西";
}
[textView resignFirstResponder];
return NO;
}
return YES;
}
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