//
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// Copyright © 2016年 Anson. All rights reserved.
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//
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#import "UIScrollView+Empty.h"
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#import <objc/runtime.h>
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#import <KVOController/KVOController.h>
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static NSString * LCUIScrollViewEmptyKVOContext = @"LCUIScrollViewEmptyKVOContext";
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@implementation UIScrollView (Empty)
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static const void *IndieEmptyViewKey = &IndieEmptyViewKey;
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#pragma mark - getter && setter
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- (void)setLc_emptyImage:(UIImage *)lc_emptyImage
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{
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UIImageView *imageView = [[UIImageView alloc]initWithFrame:self.bounds];
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imageView.image = lc_emptyImage;
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imageView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
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imageView.contentMode = UIViewContentModeCenter;
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self.lc_emptyView = imageView;
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}
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- (UIImage *)lc_emptyImage
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{
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if (self.lc_emptyView!=nil && [self.lc_emptyView isKindOfClass:[UIImageView class]])
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{
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UIImageView *imageView = (UIImageView *)self.lc_emptyView;
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return imageView.image;
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}
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return nil;
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}
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- (void)setLc_emptyView:(UIView *)lc_emptyView
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{
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lc_emptyView.hidden = self.lc_emptyView.hidden;
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if (self.lc_emptyView!=nil)
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{
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[self.lc_emptyView removeFromSuperview];
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}
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[self addSubview:lc_emptyView];
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lc_emptyView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
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[self bringSubviewToFront:lc_emptyView];
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__weak UIScrollView *weakSelf = self;
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[self.KVOController observe:self keyPath:@"contentSize" options:NSKeyValueObservingOptionNew block:^(id _Nullable observer, id _Nonnull object, NSDictionary<NSString *,id> * _Nonnull change) {
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[weakSelf contentSizeChange];
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}];
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objc_setAssociatedObject(self, IndieEmptyViewKey, lc_emptyView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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- (UIView *)lc_emptyView
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{
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UIView *emptyView = objc_getAssociatedObject(self, IndieEmptyViewKey);
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return emptyView;
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}
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#pragma mark -
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- (void)contentSizeChange
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{
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UIView *emptyView = self.lc_emptyView;
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if (emptyView==nil)
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{
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return ;
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}
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//当UITbleView时 计算出row的总行数 进行判断
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if ([self isKindOfClass:[UITableView class]])
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{
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NSLog(@"%@", @"contentSize change----");
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UITableView *tv = (UITableView *)self;
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if(tv.dataSource == nil)
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{
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return ;
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}
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if (![tv.dataSource respondsToSelector:@selector(tableView:numberOfRowsInSection:)])
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{
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return;
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}
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//默认section数为1 有委托用委托中的值
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NSInteger countOfSection = 1;
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if ([tv.dataSource respondsToSelector:@selector(numberOfSectionsInTableView:)])
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{
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countOfSection = [tv.dataSource numberOfSectionsInTableView:tv];
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}
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NSInteger allCountOfRow = 0;
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for (NSInteger i=0; i<countOfSection; i++)
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{
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allCountOfRow += [tv.dataSource tableView:tv numberOfRowsInSection:i];
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}
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if (allCountOfRow == 0)
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{
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emptyView.hidden = NO;
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[self bringSubviewToFront:emptyView];
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return ;
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}
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}//当Notepad++时 计算出item的总个数 进行判断
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else if([self isKindOfClass:[UICollectionView class]])
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{
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UICollectionView *cv = (UICollectionView *)self;
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if (cv.dataSource == nil)
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{
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return;
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}
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if (![cv.dataSource respondsToSelector:@selector(collectionView:numberOfItemsInSection:)])
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{
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return ;
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}
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if (![cv.dataSource respondsToSelector:@selector(numberOfSectionsInCollectionView:)])
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{
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return ;
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}
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//默认section数为1 有委托用委托中的值
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NSInteger countOfSection = 1;
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if ([cv.dataSource respondsToSelector:@selector(numberOfSectionsInCollectionView:)])
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{
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countOfSection = [cv.dataSource numberOfSectionsInCollectionView:cv];
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}
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NSInteger allCountOfRow = 0;
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for (NSInteger i=0; i<countOfSection; i++)
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{
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allCountOfRow += [cv.dataSource collectionView:cv numberOfItemsInSection:i];
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}
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if (allCountOfRow == 0)
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{
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emptyView.hidden = NO;
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[self bringSubviewToFront:emptyView];
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return ;
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}
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}
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emptyView.hidden = YES;
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}
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#pragma mark - clear kvo
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- (void)lc_clearEmptyViewInfo
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{
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// if ([self isRegKVO])
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// {
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// [self removeObserver:self forKeyPath:@"contentSize" context:(__bridge void * _Nullable)(LCUIScrollViewEmptyKVOContext)];
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// [self setIsRegkVO:NO];
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// }
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}
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#pragma mark - lechange ui
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@end
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