129 lines
3.3 KiB
Objective-C
Executable File
129 lines
3.3 KiB
Objective-C
Executable File
//
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// JHRefreshFooterView.m
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// JHRefresh
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//
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// Created by Jiahai on 14-9-16.
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// Copyright (c) 2014年 Jiahai. All rights reserved.
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//
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#import "JHRefreshFooterView.h"
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#import "JHRefreshConfig.h"
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#import "UIView+JHExtension.h"
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#import "UIScrollView+JHExtension.h"
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@implementation JHRefreshFooterView
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- (id)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (self) {
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// Initialization code
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}
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return self;
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}
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- (void)willMoveToSuperview:(UIView *)newSuperview
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{
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[super willMoveToSuperview:newSuperview];
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[self.superview removeObserver:self forKeyPath:JHRefreshContentSize];
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[newSuperview addObserver:self forKeyPath:JHRefreshContentSize options:NSKeyValueObservingOptionNew context:nil];
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[self ajustFooterView];
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}
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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
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{
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if([keyPath isEqualToString:JHRefreshContentSize])
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{
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[self ajustFooterView];
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}
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//正在刷新,直接返回
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if(self.state == JHRefreshStateRefreshing)
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{
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return;
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}
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if([keyPath isEqualToString:JHRefreshContentOffset])
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{
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[self changeStateWithContentOffset];
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if([self.aniView respondsToSelector:@selector(refreshViewPullingToPosition:)])
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{
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NSInteger pos = self.scrollView.contentOffset.y + self.scrollView.jh_height - self.scrollView.jh_contentSizeHeight-self.scrollView.jh_contentInsetBottom;
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//footerView不可见/全部显示后，直接返回
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if(pos <= 0 || pos > JHRefreshViewHeight)
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return;
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[self.aniView refreshViewPullingToPosition:pos];
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}
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}
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}
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- (void)changeStateWithContentOffset
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{
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CGFloat currentOffsetY = self.scrollView.contentOffset.y;
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CGFloat releaseToRefreshOffsetY = MAX(self.scrollView.jh_contentSizeHeight,self.scrollView.jh_height) - self.scrollView.jh_height + self.scrollView.jh_contentInsetBottom;
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//footerView的顶端不可见时，直接返回
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if(currentOffsetY <= releaseToRefreshOffsetY)
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{
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return;
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}
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releaseToRefreshOffsetY += JHRefreshViewHeight;
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if(self.scrollView.isDragging)
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{
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if(self.state == JHRefreshStateNormal && currentOffsetY>releaseToRefreshOffsetY)
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{
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self.state = JHRefreshStatePulling;
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}
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else if(self.state == JHRefreshStatePulling && currentOffsetY <= releaseToRefreshOffsetY)
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{
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self.state = JHRefreshStateNormal;
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}
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}
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else
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{
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if(self.state == JHRefreshStatePulling)
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{
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self.state = JHRefreshStateRefreshing;
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}
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}
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}
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/**
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* 调整footerView的位置
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*/
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- (void)ajustFooterView
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{
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CGFloat contentSizeHeight = self.scrollView.jh_contentSizeHeight;
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CGFloat height = self.scrollView.jh_height;
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self.jh_originY = MAX(height, contentSizeHeight);
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}
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- (void)setRefreshingContentInset
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{
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self.scrollView.jh_contentInsetBottom += JHRefreshViewHeight;
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}
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- (void)resumeContentInset
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{
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self.scrollView.jh_contentInsetBottom -= JHRefreshViewHeight;
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}
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/*
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// Only override drawRect: if you perform custom drawing.
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// An empty implementation adversely affects performance during animation.
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- (void)drawRect:(CGRect)rect
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{
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// Drawing code
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}
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*/
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@end
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