UITableView、UICollectionView 无数据占位

最新推荐文章于 2024-11-21 11:57:38 发布

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最新推荐文章于 2024-11-21 11:57:38 发布

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原文链接：https://juejin.im/post/5a3124156fb9a044fe465e60

本文介绍了如何在iOS应用中使用DZNEmptyDataSet组件来优雅地处理空数据状态。包括如何配置、设置代理方法以及常见问题的解决方案。

源码地址

DZNEmptyDataSet

config

导入头文件：#import <DZNEmptyDataSet/UIScrollView+EmptyDataSet.h> 继承：DZNEmptyDataSetSource,DZNEmptyDataSetDelegate

    self.tableView.emptyDataSetSource = self;
    self.tableView.emptyDataSetDelegate = self;
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e.g.：

#pragma mark: - DZNEmptyDataSetSource Methods
- (UIImage *)imageForEmptyDataSet:(UIScrollView *)scrollView {
    NSString *imageNameStr = @"common_wifi";
    return [UIImage imageNamed: ([NetworkVerification verificationCurrentNetwork] == -1) ? imageNameStr : @"common_no_record"];
}

- (NSAttributedString *)titleForEmptyDataSet:(UIScrollView *)scrollView {
    NSString *text = @"暂无列表信息!";
    if (([NetworkVerification verificationCurrentNetwork] == -1)) {
        text = @"网络连接失败，请检查网络设置";
    }
    NSMutableParagraphStyle *paragraph = [NSMutableParagraphStyle new];
    paragraph.lineBreakMode = NSLineBreakByWordWrapping;
    paragraph.alignment = NSTextAlignmentCenter;
    NSDictionary *attributes = @{NSFontAttributeName: [UIFont systemFontOfSize:13.0f],
                                 NSForegroundColorAttributeName: [UIColor lightGrayColor],
                                 NSParagraphStyleAttributeName: paragraph};
    return [[NSAttributedString alloc] initWithString:text attributes:attributes];
}

- (NSAttributedString *)descriptionForEmptyDataSet:(UIScrollView *)scrollView {
    NSString *text = @" ";
    if (([NetworkVerification verificationCurrentNetwork] == -1)) {
        text = @"点击刷新";
    }
    NSMutableParagraphStyle *paragraph = [NSMutableParagraphStyle new];
    paragraph.lineBreakMode = NSLineBreakByWordWrapping;
    paragraph.alignment = NSTextAlignmentCenter;
    NSDictionary *attributes = @{NSFontAttributeName: [UIFont systemFontOfSize:14.0f],
                                 NSForegroundColorAttributeName: [UIColor lightGrayColor],
                                 NSParagraphStyleAttributeName: paragraph};
    return [[NSAttributedString alloc] initWithString:text attributes:attributes];
}

- (UIColor *)backgroundColorForEmptyDataSet:(UIScrollView *)scrollView {
    return [Common hexStringToColor:@"#DEDEDE"];
}

- (CGFloat)spaceHeightForEmptyDataSet:(UIScrollView *)scrollView {
    return 15;
}

#pragma mark: - DZNEmptyDataSetDelegate Methods
- (void)emptyDataSet:(UIScrollView *)scrollView didTapView:(UIView *)view {
    // Do something
    debugLog(@"dosomeThing");
    //[self.tableView.mj_header beginRefreshing];
    [self checkLocationCityName];
}
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遇到的问题：不显示出来

1.要遵守数据源和代理协议
2.要刷新
3.刷新完毕后，向上偏移了解决办法

- (void)emptyDataSetWillAppear:(UIScrollView *)scrollView {
    scrollView.contentOffset = CGPointZero;
}
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