用户停止UISearchBar输入检测

Question

UISearchBar代码：

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    NSTimer *myTimer;

    NSLog(@"Timer=%@",myTimer);
    if (myTimer)
    {
        if ([myTimer isValid])
        {
            [myTimer invalidate];
        }
        myTimer=nil;
    }
    myTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(OnTextChange) userInfo:nil repeats:NO];

}

在日志中显示Timer=null，其中OnTextChange 是从URL提取数据的方法。

Answer 1

将这行代码写在 .h文件中：

NSTimer *myTimer;

然后在 .m文件中这样：

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{

    NSLog(@"Timer=%@",myTimer);
    if (myTimer)
    {
        if ([myTimer isValid])
        {
            [myTimer invalidate];
        }
        myTimer=nil;
    }
    myTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(OnTextChange) userInfo:nil repeats:NO];

}