感谢万能的github
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];
