object c求nsstring 长度和去掉前后空格的方法
NSString *searchText = [[searchBar text] stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
if ([searchText length] > 0){
self.keyWordRecord.query = searchText;
self.title = searchText;
[self startDownLoadDataFromInternet];
}
NSLog(@"searchText:%@",searchText);
