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83 lines
3.8 KiB
83 lines
3.8 KiB
2 years ago
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/**
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* Tencent is pleased to support the open source community by making QMUI_iOS available.
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* Copyright (C) 2016-2020 THL A29 Limited, a Tencent company. All rights reserved.
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* Licensed under the MIT License (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
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* http://opensource.org/licenses/MIT
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* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
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*/
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//
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// UIScrollView+QMUI.h
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// qmui
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//
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// Created by QMUI Team on 15/7/20.
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//
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#import <UIKit/UIKit.h>
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@interface UIScrollView (QMUI)
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/// 判断UIScrollView是否已经处于顶部（当UIScrollView内容不够多不可滚动时，也认为是在顶部）
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@property(nonatomic, assign, readonly) BOOL qmui_alreadyAtTop;
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/// 判断UIScrollView是否已经处于底部（当UIScrollView内容不够多不可滚动时，也认为是在底部）
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@property(nonatomic, assign, readonly) BOOL qmui_alreadyAtBottom;
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/// UIScrollView 的真正 inset，在 iOS11 以后需要用到 adjustedContentInset 而在 iOS11 以前只需要用 contentInset
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@property(nonatomic, assign, readonly) UIEdgeInsets qmui_contentInset;
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/**
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UIScrollView 默认的 contentInset，会自动将 contentInset 和 scrollIndicatorInsets 都设置为这个值并且调用一次 qmui_scrollToTopUponContentInsetTopChange 设置默认的 contentOffset，一般用于 UIScrollViewContentInsetAdjustmentNever 的列表。
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@warning 如果 scrollView 被添加到某个 viewController 上，则只有在 viewController viewDidAppear 之前（不包含 viewDidAppear）设置这个属性才会自动滚到顶部，如果在 viewDidAppear 之后才添加到 viewController 上，则只有第一次设置 qmui_initialContentInset 时才会滚动到顶部。这样做的目的是为了避免在 scrollView 已经显示出来并滚动到列表中间后，由于某些原因，contentInset 发生了中间值的变动（也即一开始是正确的值，中间变成错误的值，再变回正确的值），此时列表会突然跳到顶部的问题。
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*/
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@property(nonatomic, assign) UIEdgeInsets qmui_initialContentInset;
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/**
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* 判断当前的scrollView内容是否足够滚动
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* @warning 避免与<i>scrollEnabled</i>混淆
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*/
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- (BOOL)qmui_canScroll;
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/**
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* 不管当前scrollView是否可滚动，直接将其滚动到最顶部
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* @param force 是否无视[self qmui_canScroll]而强制滚动
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* @param animated 是否用动画表现
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*/
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- (void)qmui_scrollToTopForce:(BOOL)force animated:(BOOL)animated;
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/**
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* 等同于[self qmui_scrollToTopForce:NO animated:animated]
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*/
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- (void)qmui_scrollToTopAnimated:(BOOL)animated;
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/// 等同于[self qmui_scrollToTopAnimated:NO]
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- (void)qmui_scrollToTop;
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/**
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滚到列表顶部，但如果 contentInset.top 与上一次相同则不会执行滚动操作，通常用于 UIScrollViewContentInsetAdjustmentNever 的 scrollView 设置完业务的 contentInset 后将列表滚到顶部。
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*/
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- (void)qmui_scrollToTopUponContentInsetTopChange;
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/**
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* 如果当前的scrollView可滚动，则将其滚动到最底部
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* @param animated 是否用动画表现
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* @see [UIScrollView qmui_canScroll]
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*/
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- (void)qmui_scrollToBottomAnimated:(BOOL)animated;
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/// 等同于[self qmui_scrollToBottomAnimated:NO]
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- (void)qmui_scrollToBottom;
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// 立即停止滚动，用于那种手指已经离开屏幕但列表还在滚动的情况。
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- (void)qmui_stopDeceleratingIfNeeded;
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/**
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以动画的形式修改 contentInset
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@param contentInset 要修改为的 contentInset
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@param animated 是否要使用动画修改
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*/
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- (void)qmui_setContentInset:(UIEdgeInsets)contentInset animated:(BOOL)animated;
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@end
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