基于DZNEmptyDataSet 实现的列表无数据等状态的展示
由于DZNEmptyDataSet的实现是需要在创建的地方实现它的代理数据和方法，所以在此我对这些代理方法进行封装在一个UIScrollView 的分类当中，放出几个方法属性，这样我就不需要再创建uitabelview的时候还要进行DZNEmptyDataSet的设置，这样创建uitabelview后就可以不用再进行实现了，只需要全局引用这个分类就能够实现这些方法。当你需要改变状态后需要属性列表才能够更改成功呦（[tabelViewreloadData];）
下面是我的代码实现
typedefNS_ENUM(NSUInteger,ZJHEmptyDataSetStatus) {
ZJHEmptyDataSetStatusLoading =0,//loading
ZJHEmptyDataSetStatusNoContent,//暂时没有数据
ZJHEmptyDataSetStatusEmpty,//显示空白
ZJHEmptyDataSetStatusSuccess,//成功
ZJHEmptyDataSetStatusError,//错误
ZJHEmptyDataSetStatusDisconnect,//没有网络连接
ZJHEmptyDataSetStatusUnkonw//未知错误
};
@interface UIScrollView (ZJH_EmptyDataSte)
///列表状态
@property (nonatomic, assign) ZJHEmptyDataSetStatus status;
@property (nonatomic, assign) CGFloat verticalOffset;
///无数据，或者失败情况下是否可以滑动 默认为NO
@property (nonatomic, assign) BOOL allowScroll;
///自定义图片地址
@property (nonatomic, copy) NSString *successImage;
///自定义展示标题
@property (nonatomic, copy) NSString *successTitle;
///重新加载按钮事件
@property(nonatomic,copy)void(^emptyDataSetDidTapAction)();
@property(nonatomic,copy)void(^emptyDataSetDidDisappear)(UIScrollView*scrollView);
@end
这是实现方法
@implementation UIScrollView (ZJH_EmptyDataSte)
+(void)load {
///此处实现系统方法和自己的方法进行交换
[self zjh_swizzleMethod:@selector(initWithFrame:) withMethod:@selector(zjhswizz_initWithFrame:) error:nil];
[self zjh_swizzleMethod:@selector(initWithCoder:) withMethod:@selector(zjhswizz_initWithCoder:) error:nil];
}
- (void)setUpSourceAndDelegate {
self.emptyDataSetSource = self;
self.emptyDataSetDelegate = self;
}
#pragma mark - swizz method
- (instancetype)zjhswizz_initWithFrame:(CGRect)frame {
UIScrollView *view = [self zjhswizz_initWithFrame:frame];
[view setUpSourceAndDelegate];
return view;
}
- (instancetype)zjhswizz_initWithCoder:(NSCoder *)aDecoder {
UIScrollView *view = [self zjhswizz_initWithCoder:aDecoder];
[view setUpSourceAndDelegate];
return view;
}
#pragma mark - get & set
- (void)setStatus:(ZJHEmptyDataSetStatus)status {
[self reloadEmptyDataSet];
return objc_setAssociatedObject(self, @selector(status), @(status), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (ZJHEmptyDataSetStatus)status {
return [objc_getAssociatedObject(self, _cmd) integerValue];
}
- (void)setSuccessImage:(NSString *)successImage {
return objc_setAssociatedObject(self, @selector(successImage), successImage, OBJC_ASSOCIATION_COPY);
}
- (NSString *)successImage {
return objc_getAssociatedObject(self, _cmd);
}
- (void)setSuccessTitle:(NSString *)successTitle {
return objc_setAssociatedObject(self, @selector(successTitle), successTitle, OBJC_ASSOCIATION_COPY);
}
- (NSString *)successTitle {
return objc_getAssociatedObject(self, _cmd);
}
- (void)setVerticalOffset:(CGFloat)verticalOffset {
return objc_setAssociatedObject(self, @selector(verticalOffset), @(verticalOffset), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (CGFloat)verticalOffset {
return [objc_getAssociatedObject(self, _cmd) floatValue];
}
- (void)setAllowScroll:(BOOL)allowScroll {
return objc_setAssociatedObject(self, @selector(allowScroll), @(allowScroll), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (BOOL)allowScroll {
return objc_getAssociatedObject(self, _cmd);
}
- (void)setEmptyDataSetDidTapAction:(void (^)())emptyDataSetDidTapAction {
return objc_setAssociatedObject(self, @selector(emptyDataSetDidTapAction), emptyDataSetDidTapAction, OBJC_ASSOCIATION_COPY);
}
- (void (^)())emptyDataSetDidTapAction {
return objc_getAssociatedObject(self, _cmd);
}
- (void)setEmptyDataSetDidDisappear:(void (^)(UIScrollView *))emptyDataSetDidDisappear {
return objc_setAssociatedObject(self, @selector(emptyDataSetDidDisappear), emptyDataSetDidDisappear, OBJC_ASSOCIATION_COPY);
}
- (void (^)(UIScrollView *))emptyDataSetDidDisappear {
return objc_getAssociatedObject(self, _cmd);
}
- (CAAnimation *)imageAnimationForEmptyDataSet:(UIScrollView *)scrollView
{
CAKeyframeAnimation *scaleAnim = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];
scaleAnim.keyTimes = @[@0, @0.5, @1];
scaleAnim.values = @[@1, @0.6, @1];
CAKeyframeAnimation *rotateAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
rotateAnimation.keyTimes = scaleAnim.keyTimes;
rotateAnimation.values = @[@0, @(M_PI), @(2 * M_PI)];
CAAnimationGroup *groupAnim = [[CAAnimationGroup alloc] init];
groupAnim.animations = @[scaleAnim,rotateAnimation];
groupAnim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
groupAnim.duration = 1;
groupAnim.removedOnCompletion = NO;
groupAnim.repeatCount = MAXFLOAT;
return groupAnim;
}
#pragma mark - DZNEmptyDataSetSource
- (UIImage *)imageForEmptyDataSet:(UIScrollView *)scrollView{
if (self.successImage.length > 0) {
return [UIImage imageNamed:self.successImage];
}
switch (self.status) {
case ZJHEmptyDataSetStatusLoading:
return [UIImage imageNamed:@"loading1"];
break;
case ZJHEmptyDataSetStatusNoContent:
return [UIImage imageNamed:@"NoData"];
break;
case ZJHEmptyDataSetStatusEmpty:
break;
case ZJHEmptyDataSetStatusSuccess:
return [UIImage imageNamed:@""];
break;
case ZJHEmptyDataSetStatusError:
return [UIImage imageNamed:@"noNet"];
break;
case ZJHEmptyDataSetStatusDisconnect:
return [UIImage imageNamed:@"noNet"];
break;
case ZJHEmptyDataSetStatusUnkonw:
break;
default:
break;
}
return nil;
}
- (NSAttributedString *)titleForEmptyDataSet:(UIScrollView *)scrollView{
if (self.successTitle.length > 0) {
if (self.successTitle) {
NSMutableAttributedString *attributed = [[NSMutableAttributedString alloc] init];
NSMutableParagraphStyle *paragraph = [NSMutableParagraphStyle new];
paragraph.lineBreakMode = NSLineBreakByWordWrapping;
paragraph.alignment = NSTextAlignmentCenter;
NSDictionary *attributes = @{NSFontAttributeName: [UIFont systemFontOfSize:16.0f],NSForegroundColorAttributeName: [UIColor darkGrayColor],
NSParagraphStyleAttributeName: paragraph};
[attributed setAttributedString:[[NSAttributedString alloc] initWithString:self.successTitle attributes:attributes]];
return attributed;
}
}
NSString *text = nil;
switch (self.status) {
case ZJHEmptyDataSetStatusLoading:
break;
case ZJHEmptyDataSetStatusNoContent:
text = @"还没有内容哦~";
break;
case ZJHEmptyDataSetStatusEmpty:
break;
case ZJHEmptyDataSetStatusSuccess:
text = self.successTitle;
break;
case ZJHEmptyDataSetStatusError:
text = @"服务器发生了一点错误";
break;
case ZJHEmptyDataSetStatusDisconnect:
text = @"网络请求失败";
break;
case ZJHEmptyDataSetStatusUnkonw:
text = @"与服务器连接失败";
break;
default:
break;
}
if (text) {
NSMutableAttributedString *attributed = [[NSMutableAttributedString alloc] init];
NSMutableParagraphStyle *paragraph = [NSMutableParagraphStyle new];
paragraph.lineBreakMode = NSLineBreakByWordWrapping;
paragraph.alignment = NSTextAlignmentCenter;
NSDictionary *attributes = @{NSFontAttributeName: [UIFont systemFontOfSize:16.0f],NSForegroundColorAttributeName: [UIColor darkGrayColor],
NSParagraphStyleAttributeName: paragraph};
[attributed setAttributedString:[[NSAttributedString alloc] initWithString:text attributes:attributes]];
return attributed;
}
return nil;
}
- (CGFloat)verticalOffsetForEmptyDataSet:(UIScrollView *)scrollView
{
return self.verticalOffset != 0 ? -self.verticalOffset : -50;
}
- (UIImage *)buttonImageForEmptyDataSet:(UIScrollView *)scrollView forState:(UIControlState)state{
if (self.status == ZJHEmptyDataSetStatusDisconnect || self.status == ZJHEmptyDataSetStatusError || self.status == ZJHEmptyDataSetStatusUnkonw) {
return [UIImage imageNamed:@"reloadBackground"];
}
return nil;
}
- (NSAttributedString *)buttonTitleForEmptyDataSet:(UIScrollView *)scrollView forState:(UIControlState)state
{
if (self.status == ZJHEmptyDataSetStatusDisconnect || self.status == ZJHEmptyDataSetStatusError || self.status == ZJHEmptyDataSetStatusUnkonw) {
NSMutableAttributedString *attributed = [[NSMutableAttributedString alloc] init];
NSMutableParagraphStyle *paragraph = [NSMutableParagraphStyle new];
paragraph.lineBreakMode = NSLineBreakByWordWrapping;
paragraph.alignment = NSTextAlignmentCenter;
NSDictionary *attributes = @{NSFontAttributeName: [UIFont systemFontOfSize:16.0f],NSForegroundColorAttributeName: [UIColor blueColor],
NSParagraphStyleAttributeName: paragraph};
[attributed setAttributedString:[[NSAttributedString alloc] initWithString:@"重新加载" attributes:attributes]];
return attributed;
}
return nil;
}
#pragma mark - DZNEmptyDataSetDelegate
- (void)emptyDataSet:(UIScrollView *)scrollView didTapButton:(UIButton *)button{
if (self.emptyDataSetDidTapAction) {
self.emptyDataSetDidTapAction();
}
}
- (void)emptyDataSetDidDisappear:(UIScrollView *)scrollView {
if (self.emptyDataSetDidDisappear) {
self.emptyDataSetDidDisappear(scrollView);
}
}
- (BOOL)emptyDataSetShouldAnimateImageView:(UIScrollView *)scrollView{
if (self.status == ZJHEmptyDataSetStatusLoading) {
return YES;
} else {
return NO;
}
}
- (BOOL)emptyDataSetShouldAllowTouch:(UIScrollView *)scrollView {
return YES;
}
- (BOOL)emptyDataSetShouldAllowScroll:(UIScrollView *)scrollView {
return self.allowScroll;
}
@end
感觉可以的话可以关注我哦