DZNEmptyDataSet框架简介

Posted 2020-06-17 Hakim_Fan

给大家推荐一个设置页面加载失败时显示加载失败等的框架。

下载地址:DZNEmptyDataSet https://github.com/dzenbot/DZNEmptyDataSet

上效果
首先在你的ViewController里面导入
#import "UIScrollView+EmptyDataSet.h"
遵守 <DZNEmptyDataSetSource, DZNEmptyDataSetDelegate> 协议

`@interface MainViewController : UITableViewController <DZNEmptyDataSetSource, DZNEmptyDataSetDelegate>

• (void)viewDidLoad
  {
  [super viewDidLoad];
  self.tableView.emptyDataSetSource = self;
  self.tableView.emptyDataSetDelegate = self; // A little trick for removing the cell separators self.tableView.tableFooterView = [UIView new];
  }`

返回单张图片

Data Source 实现方法
- (UIImage *)imageForEmptyDataSet:(UIScrollView *)scrollView { return [UIImage imageNamed:@"empty_placeholder"]; }

返回标题文字

- (NSAttributedString *)titleForEmptyDataSet:(UIScrollView *)scrollView { NSString *text = @"Please Allow Photo Access"; NSDictionary *attributes = @{NSFontAttributeName: [UIFont boldSystemFontOfSize:18.0f], NSForegroundColorAttributeName: [UIColor darkGrayColor]}; return [[NSAttributedString alloc] initWithString:text attributes:attributes]; }

返回详情文字

- (NSAttributedString *)descriptionForEmptyDataSet:(UIScrollView *)scrollView{ NSString *text = @"This allows you to share photos from your library and save photos to your camera roll."; 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]; }

返回可以点击的按钮 上面带文字

- (NSAttributedString *)buttonTitleForEmptyDataSet:(UIScrollView *)scrollView forState:(UIControlState)state{ NSDictionary *attributes = @{NSFontAttributeName: [UIFont boldSystemFontOfSize:17.0f]}; return [[NSAttributedString alloc] initWithString:@"Continue" attributes:attributes];}

返回可以点击的按钮 上面带图片

- (UIImage *)buttonImageForEmptyDataSet:(UIScrollView *)scrollView forState:(UIControlState)state{ return [UIImage imageNamed:@"button_image"];}

返回空白区域的颜色自定义

- (UIColor *)backgroundColorForEmptyDataSet:(UIScrollView *)scrollView{ return [UIColor whiteColor];}

返回一个自定义的 view

• (UIView )customViewForEmptyDataSet:(UIScrollView )scrollView{ UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; [activityView startAnimating]; return activityView;}

此外,您还可以调整垂直对齐的内容视图(即:有用tableHeaderView时可见):

- (CGFloat)verticalOffsetForEmptyDataSet:(UIScrollView *)scrollView{ return -self.tableView.tableHeaderView.frame.size.height/2.0f;}

返回间距离

• (CGFloat)verticalOffsetForEmptyDataSet:(UIScrollView *)scrollView{ return -self.tableView.tableHeaderView.frame.size.height/2.0f;}

委托实现

要求知道空的状态应该渲染和显示 (Default is YES) :
- (BOOL)emptyDataSetShouldDisplay:(UIScrollView *)scrollView{ return YES;}

是否允许点击 (默认是 YES) :
- (BOOL)emptyDataSetShouldAllowTouch:(UIScrollView *)scrollView{ return YES;}

是否允许滚动 (默认是 NO) :
- (BOOL)emptyDataSetShouldAllowScroll:(UIScrollView *)scrollView{ return YES;}

空白区域点击响应:
- (void)emptyDataSetDidTapView:(UIScrollView *)scrollView{ // Do something}

点击button 响应
- (void)emptyDataSetDidTapButton:(UIScrollView *)scrollView{ // Do something}

刷新当前表格
[self.tableView reloadData];
或者
[self.collectionView reloadData];