106 lines
2.7 KiB
Objective-C
Executable File
106 lines
2.7 KiB
Objective-C
Executable File
//
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// JHRefreshHeaderView.m
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// JHRefresh
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//
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// Created by Jiahai on 14-9-15.
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// Copyright (c) 2014年 Jiahai. All rights reserved.
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//
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#import "JHRefreshHeaderView.h"
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#import "JHRefreshConfig.h"
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#import "UIScrollView+JHExtension.h"
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#import "UIView+JHExtension.h"
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@implementation JHRefreshHeaderView
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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.jh_originY = -JHRefreshViewHeight;
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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(self.state == JHRefreshStateRefreshing)
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return;
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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;
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//headerView不可见/全部可见时，直接返回
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if(pos > 0 || pos < -JHRefreshViewHeight-self.scrollView.jh_contentInsetTop)
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return;
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[self.aniView refreshViewPullingToPosition:abs((int)pos)-self.scrollView.jh_contentInsetTop];
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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 = - self.scrollView.jh_contentInsetTop;
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//headerView的顶端不可见时，直接返回
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if(currentOffsetY>=releaseToRefreshOffsetY)
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return;
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releaseToRefreshOffsetY -= self.jh_height;
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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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//即将刷新
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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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//普通状态
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self.state = JHRefreshStateNormal;
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}
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}
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else if (self.state == JHRefreshStatePulling)
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{
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//开始刷新
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self.state = JHRefreshStateRefreshing;
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}
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}
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- (void)setRefreshingContentInset
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{
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self.scrollView.jh_contentInsetTop += JHRefreshViewHeight;
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}
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- (void)resumeContentInset
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{
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self.scrollView.jh_contentInsetTop -= 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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