UITextField 自定义搜索栏

searchField = [[UITextField alloc]initWithFrame:CGRectMake(0,5,320,36)] ;
    searchField.textColor= [UIColor colorWithRed:0.0/255.0 green:103.0/255.0 blue:155.0/255.0 alpha:1.0];
    searchField.font= [UIFont systemFontOfSize:16] ;
    searchField.backgroundColor= [UIColor blueColor];
    //搜索栏内容的位置
    searchField.contentVerticalAlignment=UIControlContentVerticalAlignmentBottom;
    [searchField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged]; // textField的文本发生变化时相应事件
//    设置ReturnKeyType为UIRetuirKeySearch;
    [searchField setReturnKeyType:UIReturnKeySearch];
//    设置UITextField的delegate为self
    searchField.delegate=self;
    mytableView.tableHeaderView = searchField;

- (void) textFieldDidChange:(UITextField*) TextField{
    NSLog(@"textFieldDidChange textFieldDidChange %@", TextField.text);
    
    
    NSString *conditionStr = TextField.text;
    NSLog(@"+++++%@", conditionStr);
    // 2. 创建谓词，准备进行判断的工具
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self.nameString CONTAINS [CD] %@ ", conditionStr];
    seachArray = [NSMutableArray arrayWithArray:[allNameArray filteredArrayUsingPredicate:predicate]];
    NSLog(@" searchMuArray  = %@", seachArray);
    
    [mytableView reloadData];
    
    if(![TextField.text isEqualToString:@""]) {
//        delButton.hidden=NO;  // 仿制searchbar后面的小叉叉
    } else{
//        delButton.hidden=YES;
    }
}

- (void)fieldCancleButton {
     searchField.text = @"";
    [self textFieldDidChange:searchField];
}