Question

- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section {  

    if(footerView == nil) {
        //allocate the view if it doesn't exist yet
        footerView  = [[UIView alloc] init];


        UIImage *image = [[UIImage imageNamed:@"update.png"]
                          stretchableImageWithLeftCapWidth:8 topCapHeight:8];

        //create the button
        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        [button setBackgroundImage:image forState:UIControlStateNormal];

        //the button should be as big as a table view cell
        [button setFrame:CGRectMake(100, 3, 300, 50)];

        NSDate *today = [NSDate date];
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        // display in 12HR/24HR (i.e. 11:25PM or 23:25) format according to User Settings
        [dateFormatter setTimeStyle:NSDateFormatterShortStyle];
        NSString *currentTime = [dateFormatter stringFromDate:today];


        [dateFormatter release];
        NSLog(@"User's current time in their preference format:%@",currentTime);

        NSString *btnString;


        NSDate* now = [NSDate date];
                btnString = [NSString stringWithFormat:@"%@:%@",@"Update",currentTime];     


        //set title, font size and font color
        [button setTitle:btnString forState:UIControlStateNormal];
        [button.titleLabel setFont:[UIFont boldSystemFontOfSize:20]];
        [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

        //set action of the button
        [button addTarget:self action:@selector(update:)
         forControlEvents:UIControlEventTouchUpInside];

        [footerView addSubview:button];

    }
    return footerView;  
}

这里我试图在页脚部分视图中添加按钮，按钮包含文本为“Update：currentTime” - ＆gt;例如“更新：下午4点30分” 因此用户将了解他何时进行最后更新，但现在当我按下此按钮更新在视图中完成但我想更新（刷新）按钮的文本，例如，如果我在15分钟后按下按钮它将显示“更新：4 ：下午45点“......如何刷新本文

非常感谢

Answer 1

您的“更新：”方法会收到按钮作为发件人。发件人应该作为一个id对象，然后你可以将它转换为UIButton *并按照你想要的方式更新它的文本：

void update:(id)sender {    
[(UIButton)*sender setTitle:@"NEW TEXT" forState:UIControlStateNormal];
//rest of your update code
}

如何刷新viewForFooterInSection

1 个答案: