DZNEmptyDataSet，优秀的空白页或者出错页封装

## 简介

项目主页:https://github.com/dzenbot/DZNEmptyDataSet

提示：主要用于UITableView和UICollectionView，也可以用于UIScrollView，其实主要是前两个会用到空白或者网络出错页

采用给UIScrollView添加代理方法来给页面添加空白页，源码很有学习意义

导入工程

自动，

pod 'DZNEmptyDataSet'

手动

https://github.com/dzenbot/DZNEmptyDataSet 下载解压，Source文件夹下的文件拖入工程

导入头文件：

#import "UIScrollView+EmptyDataSet.h"

初始化

    @interface MainViewController : UITableViewController <DZNEmptyDataSetSource, DZNEmptyDataSetDelegate>    － (void)viewDidLoad {         [super viewDidLoad];         self.tableView.emptyDataSetSource = self;         self.tableView.emptyDataSetDelegate = self;    //这行代码必须加上，可以去除tableView的多余的线，否则会影响美观         self.tableView.tableFooterView = [UIView new];    }

满足代理方法，可以分别配置，都是可选的

空白页图片

    - (UIImage *)imageForEmptyDataSet:(UIScrollView *)scrollView {    return [UIImage imageNamed:@"empty_placeholder"];    }

图片的动画效果

    - (CAAnimation *)imageAnimationForEmptyDataSet:(UIScrollView *)scrollView {    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath: @"transform"];    animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];    animation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI_2, 0.0, 0.0, 1.0)];    animation.duration = 0.25;    animation.cumulative = YES;    animation.repeatCount = MAXFLOAT;    return animation;    }

标题文本，详细描述，富文本样式

    - (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];    }    - (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];                          }

按钮文本或者背景样式

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

空白页的背景色

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

如果需求无法满足，你可以自定义

    - (UIView *)customViewForEmptyDataSet:(UIScrollView *)scrollView {    //加入你自定义的view    UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];    [activityView startAnimating];    return activityView;    }

其他需求

    //是否显示空白页，默认YES    - (BOOL)emptyDataSetShouldDisplay:(UIScrollView *)scrollView {    return YES;    }    //是否允许点击，默认YES    - (BOOL)emptyDataSetShouldAllowTouch:(UIScrollView *)scrollView {    return YES;    }    //是否允许滚动，默认NO    - (BOOL)emptyDataSetShouldAllowScroll:(UIScrollView *)scrollView {    return YES;    }    //图片是否要动画效果，默认NO    - (BOOL) emptyDataSetShouldAllowImageViewAnimate:(UIScrollView *)scrollView {    return YES;    }    //空白页点击事件    - (void)emptyDataSetDidTapView:(UIScrollView *)scrollView {    }    //空白页按钮点击事件    - (void)emptyDataSetDidTapButton:(UIScrollView *)scrollView {    }

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