如何查看字符串是否包含子字符串（objective-c） [英] how to see if a string contains a substring (objective-c)

问题描述

我想查看一个字符串，这是苹果rss新闻源上的帖子的标题包含一个子字符串，例如。 史蒂夫或工作。

I want to see if a string, which is a title of a post on the apple rss news feed contains a substring, e.g. "Steve" or "Jobs". I organized the posts into a uitableview.

所以这里有一个标题中有史蒂夫或乔布斯的帖子，所以我用这个来检查：

So there WAS a post which had Steve or Jobs in its title so I used this to check:

   if ([[entry title] localizedCaseInsensitiveCompare:@"Steve"] == NSOrderedSame ||        [[entry title] localizedCaseInsensitiveCompare: @"Jobs"] == NSOrderedSame) {

    NSLog(@"Comparism of Steve Jobs");
    cell.imageView.image = [UIImage imageNamed:@"steve.png"];
}

但它从来没有被调用，entry是一个RSSItem类，该条目及其标题不是我的问题，我已经检查过。我的比较是问题。如何比较

But it was never called, entry is an RSSItem class which contains the title - the entry and its title is not my problem, I have checked. My comparism is the problem. How do i compare

UPDATE！

确定这里是代码：

NSRange range = [[[cell textLabel] text] rangeOfString:@"Steve" options:NSCaseInsensitiveSearch];

if (range.location != NSNotFound) 
{
    cell.imageView.image = [UIImage imageNamed:@"steve.png"];


}

但同一结果：

一些单元格的imageView为steve.png，即使他们的标题不包含steve作业。奇怪的？？？我向下滚动，当我回去时，所有重新分配和初始化的出队单元都有steve作业图片。开始时我打开应用程序的一些细胞，他们的标题没有史蒂夫有图像，然后上述发生。

some cells have their imageView as steve.png even though their title doesnt contain steve jobs. Weird??? I scroll down and when I go back up all the dequeued cells which are reallocated and initialized have the steve jobs picture. At starting when i open the app some cells which don't have steve in their title DO HAVE THE IMAGE, and then the above happens.

我的周围的代码如果需要：

My surrounding code IF NEEDED:

  -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

UITableViewCell *cell = [tableView
                         dequeueReusableCellWithIdentifier:@"UITableViewCell"];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                   reuseIdentifier:@"UITableViewCell"]
            autorelease];
}


tableView.autoresizingMask = 5;
tableView.autoresizesSubviews = YES;
cell.autoresizingMask = 5;
cell.frame = CGRectMake(cell.frame.origin.x, cell.frame.origin.y, 20, 20);
RSSItem *item = [[channel items] objectAtIndex:[indexPath row]];
[[cell textLabel] setText:[item title]];
NSMutableString *string = [[NSMutableString alloc] initWithString:[[cell textLabel] text]];

if (string.length > 46) {
    cell.textLabel.numberOfLines = 2;
    UILineBreakMode lineBreak = UILineBreakModeClip;
    cell.textLabel.lineBreakMode = lineBreak;

}

[string release];

tableView.backgroundColor = [UIColor darkGrayColor];
cell.textLabel.font = [UIFont fontWithName:@"Arial Rounded MT Bold" size: 12.0];
cell.backgroundColor = [UIColor whiteColor];

NSRange range = [[[cell textLabel] text] rangeOfString:@"Steve" options:NSCaseInsensitiveSearch];

if (range.location != NSNotFound) 
{
    cell.imageView.image = [UIImage imageNamed:@"steve.png"];


    }



return cell;

    }

推荐答案

当我向上滚动所有回收的单元格都有史蒂夫作业图像

"then when i scroll back up all the recycled cells have the steve jobs image"

这是因为您不会重置回收单元格中的图像。 （尝试添加

That's because you're not resetting the image in the recycled cells. (Try adding

else { 
    cell.imageView.image = nil; 
}

。

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