DZN 占位图

来源：互联网发布：php 记log日志编辑：程序博客网时间：2024/05/12 15:33

#import "Team9EmptyTool.h"

#import "Team9Header.h"

#import <MJRefresh.h>

#import <UIScrollView+EmptyDataSet.h>

//#import "AppDelegate.h"

#import <AFNetworking.h>

@interface Team9EmptyTool ()<DZNEmptyDataSetDelegate,DZNEmptyDataSetSource>

@end

@implementation Team9EmptyTool

- (instancetype)initWithScrollView:(UIScrollView *)scrollView{

self = [super init];

if (self) {

scrollView.emptyDataSetDelegate = self;

scrollView.emptyDataSetSource = self;

self.scrollView = scrollView;

AFNetworkReachabilityManager *manger = [AFNetworkReachabilityManager sharedManager];

self.loading = manger.networkReachabilityStatus;

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeNet) name:@"changeNet" object:nil];

}

return self;

}

- (void)dealloc{

[[NSNotificationCenter defaultCenter] removeObserver:self];

}

- (void)changeNet{

AFNetworkReachabilityManager *manger = [AFNetworkReachabilityManager sharedManager];

self.loading = manger.networkReachabilityStatus;

[self.scrollView reloadEmptyDataSet];

if (self.loading) {

[self.scrollView.header beginRefreshing];

[self.scrollView.footer resetNoMoreData];

} else [self.scrollView.header endRefreshing];

[self.scrollView reloadEmptyDataSet];

}

+ (Team9EmptyTool *)toolWithScrollView:(UIScrollView *)scrollView{

Team9EmptyTool *tool = [[Team9EmptyTool alloc]initWithScrollView:scrollView];

return tool;

}

初始化工具类之后有一个loading 这个是刷新的动画是否播放

afn 监听网络状态改变loading

刷新的block 把loading 改变

重写loading set方法, loading yes的时候刷新scrollview的emptyset

需要刷新数据的地方调用 header

调用header的时候调用 loading的set方法

让占位图和刷新状态一致

header -> setLoading

setLoading -> reloadEmptySet ->header

注意不要产生递归现象

方法需要自己看demo

- (void)setLoading:(BOOL)loading

{

if (self.isLoading == loading) {

return;

}

_loading = loading;

if (loading == YES) {

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

self.loading = NO;

});

}

[self.scrollView reloadEmptyDataSet];

}

#pragma mark 背景字

- (NSAttributedString *)titleForEmptyDataSet:(UIScrollView *)scrollView

{

NSString *text = nil;

UIFont *font = nil;

NSMutableDictionary *attributes = [NSMutableDictionary new];

NSMutableParagraphStyle *paragraph = [NSMutableParagraphStyle new];

paragraph.lineBreakMode = NSLineBreakByWordWrapping;

paragraph.alignment = NSTextAlignmentCenter;

AFNetworkReachabilityManager *manger = [AFNetworkReachabilityManager sharedManager];

switch (manger.networkReachabilityStatus) {

case AFNetworkReachabilityStatusUnknown:

text = @"未知网络";

break;

case AFNetworkReachabilityStatusReachableViaWWAN:

text = @"蜂窝网络";

break;

case AFNetworkReachabilityStatusReachableViaWiFi:

text = @"wifi";

break;

case AFNetworkReachabilityStatusNotReachable:

default:

text = @"没有网络";

break;

}

font = [UIFont boldSystemFontOfSize:20.0];

if (font) [attributes setObject:font forKey:NSFontAttributeName];

if (paragraph) [attributes setObject:paragraph forKey:NSParagraphStyleAttributeName];

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:text attributes:attributes];

return attributedString;

}

#pragma mark 背景button

- (NSAttributedString *)descriptionForEmptyDataSet:(UIScrollView *)scrollView

{

NSString *text = nil;

UIFont *font = nil;

NSMutableDictionary *attributes = [NSMutableDictionary new];

NSMutableParagraphStyle *paragraph = [NSMutableParagraphStyle new];

paragraph.lineBreakMode = NSLineBreakByWordWrapping;

paragraph.alignment = NSTextAlignmentCenter;

text = @"点击或下拉刷新";

font = [UIFont boldSystemFontOfSize:15.0];

if (font) [attributes setObject:font forKey:NSFontAttributeName];

if (paragraph) [attributes setObject:paragraph forKey:NSParagraphStyleAttributeName];

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:text attributes:attributes];

return attributedString;

}

#pragma mark 背景图

- (UIImage *)imageForEmptyDataSet:(UIScrollView *)scrollView

{

if (self.isLoading) {

return [UIImage imageNamed:@"loading_imgBlue_78x78"];

}

else {

return [UIImage imageNamed:@"placeholder_remote"];

}

#pragma mark 背景色

- (UIColor *)backgroundColorForEmptyDataSet:(UIScrollView *)scrollView

{

if ([Team9EveningType shareEvening].eveningFailling) {

return [UIColor colorWithWhite:0.15 alpha:1];

} else return [UIColor colorWithWhite:0.95 alpha:1];

}

#pragma mark 未用背景button 图

- (UIImage *)buttonBackgroundImageForEmptyDataSet:(UIScrollView *)scrollView forState:(UIControlState)state

{

NSString *imageName;

if (state == UIControlStateNormal) imageName =@"button_normal";

if (state == UIControlStateHighlighted) imageName =@"button_highlight";

UIEdgeInsets capInsets = UIEdgeInsetsMake(10.0,10.0, 10.0,10.0);

UIEdgeInsets rectInsets = UIEdgeInsetsZero;

return [[[UIImage imageNamed:imageName] resizableImageWithCapInsets:capInsets resizingMode:UIImageResizingModeStretch] imageWithAlignmentRectInsets:rectInsets];

}

#pragma mark 背景动画

- (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;

}

#pragma mark 展示emptySet

- (BOOL)emptyDataSetShouldDisplay:(UIScrollView *)scrollView

{

return YES;

}

#pragma mark 可点

- (BOOL)emptyDataSetShouldAllowTouch:(UIScrollView *)scrollView

{

return YES;

}

#pragma mark 可滚

- (BOOL)emptyDataSetShouldAllowScroll:(UIScrollView *)scrollView

{

return YES;

}

#pragma mark 是否有动画这个可改变刷新就变

- (BOOL)emptyDataSetShouldAnimateImageView:(UIScrollView *)scrollView

{

return self.isLoading;

}

#pragma mark 点击

- (void)emptyDataSet:(UIScrollView *)scrollView didTapView:(UIView *)view

{

self.loading = YES;

[self.scrollView.header beginRefreshing];

}

#pragma mark 滚动

- (void)emptyDataSet:(UIScrollView *)scrollView didTapButton:(UIButton *)button

{

self.loading = YES;

[self.scrollView.header beginRefreshing];

}

#pragma mark - View Auto-Rotation

- (UIInterfaceOrientationMask)supportedInterfaceOrientations

{

return UIInterfaceOrientationMaskAll;

}

- (BOOL)shouldAutorotate

{

return NO;

}

@end

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