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Apache License | ||
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# | ||
# Be sure to run `pod spec lint KIPageView.podspec' to ensure this is a | ||
# valid spec and to remove all comments including this before submitting the spec. | ||
# | ||
# To learn more about Podspec attributes see http://docs.cocoapods.org/specification.html | ||
# To see working Podspecs in the CocoaPods repo see https://github.com/CocoaPods/Specs/ | ||
# | ||
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Pod::Spec.new do |s| | ||
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# ――― Spec Metadata ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # | ||
# | ||
# These will help people to find your library, and whilst it | ||
# can feel like a chore to fill in it's definitely to your advantage. The | ||
# summary should be tweet-length, and the description more in depth. | ||
# | ||
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s.name = "KIPageView" | ||
s.version = "0.1" | ||
s.summary = "KIPageView" | ||
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s.description = <<-DESC | ||
## KIPageView | ||
UITableView 很强大,可是只能竖向滚动;UICollectionView 可以解决各种布局难题,但是稍显复杂,对于一些简单的需求,有点杀鸡用牛刀的感觉。 | ||
在 iOS6 以前,还没有 UICollectionView,为了实现横向滚动的 UITableView,只有自己动手写组件。为了达到和 UITableView 差不多的效果,就得先弄清其内部实现机制是怎么回事。 | ||
在渲染 View 的时候,是很耗系统资源的,如果创建大量的 View, 系统运行将变得异常缓慢,甚至导致内存耗尽。但是,在实际应用中,我们难免会遇到大量的数据需要显示,如果每显示一个数据,我们都创建一个 View,那应用程序的体验将相当糟糕。所以 Apple 为 iOS 开发者提供了 UITableView,Google 为 Android 开发者提供了 ListView。 | ||
简单来讲,UITableView 采用复用机制,其只会显示其可见区域内的 UITableViewCell。我们在滑动的过程中,当超出 UITableView 可见区域的 Cell,将会从 UITableView 中移除,并加入回收池中以作复用。当 UITableView 需要显示新的 Cell,会先从回收池中查找是否有相应的 Cell 可以重用(通过 dequeueReusableCellWithIdentifier:)。如果有,则直接将其重新显示;如果没有,则创建新的 Cell。这样一来,就可以避免因创建过多的 View,导致内存耗尽的尴尬情况。 | ||
了解了其内部的运行原理,我们也可以实现一个自己的 UITableView。 | ||
很常见的一个应用场景——显示图片:如果显示一张图片,我们用一个 UIImageView 足矣,如果要显示多张图片,并且可以左右滚动,最简单的办法是用一个 UIScrollView 包含多个 UIImageView, 但是这样带来的后果则是,如果图片数据量较大,那这个程序根本没有办法正常使用。如果我们还需要实现无限循环滚动,那这个解决方案肯定是不行的。所以这时候,就得我们自己实现一个 UITableView。 | ||
最开始,我写了一个组件叫 KIFlowView,实现了上面讲的需求,但是都是 iOS5 时代的产物了,难免过于陈旧。在后续的工作中也发现,类似的需求其实挺多的,比如左右滑动的 View,如网易新闻客户端,可以左右滑动,在不同的新闻栏目之间进行切换;有时候我们也需要实现一些 Tab,如果 Tab 的项目比较多,也需要考虑复用的问题,所以决定重新写一个增强组件,作为其替代品,所以就产生了 KIPageView。 | ||
DESC | ||
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s.homepage = "https://github.com/smartwalle/KIPageView" | ||
# s.screenshots = "www.example.com/screenshots_1.gif", "www.example.com/screenshots_2.gif" | ||
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# ――― Spec License ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # | ||
# | ||
# Licensing your code is important. See http://choosealicense.com for more info. | ||
# CocoaPods will detect a license file if there is a named LICENSE* | ||
# Popular ones are 'MIT', 'BSD' and 'Apache License, Version 2.0'. | ||
# | ||
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s.license = { :type => 'Apache License, Version 2.0', :file => 'COPYING' } | ||
# s.license = { :type => "MIT", :file => "FILE_LICENSE" } | ||
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# ――― Author Metadata ――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # | ||
# | ||
# Specify the authors of the library, with email addresses. Email addresses | ||
# of the authors are extracted from the SCM log. E.g. $ git log. CocoaPods also | ||
# accepts just a name if you'd rather not provide an email address. | ||
# | ||
# Specify a social_media_url where others can refer to, for example a twitter | ||
# profile URL. | ||
# | ||
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s.author = { "SmartWalle" => "[email protected]" } | ||
# Or just: s.author = "SmartWalle" | ||
# s.authors = { "SmartWalle" => "[email protected]" } | ||
# s.social_media_url = "http://twitter.com/杨烽" | ||
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# ――― Platform Specifics ――――――――――――――――――――――――――――――――――――――――――――――――――――――― # | ||
# | ||
# If this Pod runs only on iOS or OS X, then specify the platform and | ||
# the deployment target. You can optionally include the target after the platform. | ||
# | ||
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s.platform = :ios | ||
# s.platform = :ios, "5.0" | ||
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# When using multiple platforms | ||
# s.ios.deployment_target = "5.0" | ||
# s.osx.deployment_target = "10.7" | ||
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# ――― Source Location ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # | ||
# | ||
# Specify the location from where the source should be retrieved. | ||
# Supports git, hg, bzr, svn and HTTP. | ||
# | ||
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s.source = { :git => "https://github.com/smartwalle/KIPageView.git", :tag => "0.1" } | ||
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# ――― Source Code ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # | ||
# | ||
# CocoaPods is smart about how it includes source code. For source files | ||
# giving a folder will include any swift, h, m, mm, c & cpp files. | ||
# For header files it will include any header in the folder. | ||
# Not including the public_header_files will make all headers public. | ||
# | ||
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s.source_files = "KIPageView/KIPageView/*.{h,m}" | ||
s.exclude_files = "Classes/Exclude" | ||
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# s.public_header_files = "Classes/**/*.h" | ||
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# ――― Resources ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # | ||
# | ||
# A list of resources included with the Pod. These are copied into the | ||
# target bundle with a build phase script. Anything else will be cleaned. | ||
# You can preserve files from being cleaned, please don't preserve | ||
# non-essential files like tests, examples and documentation. | ||
# | ||
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# s.resource = "icon.png" | ||
# s.resources = "Resources/*.png" | ||
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# s.preserve_paths = "FilesToSave", "MoreFilesToSave" | ||
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# ――― Project Linking ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # | ||
# | ||
# Link your library with frameworks, or libraries. Libraries do not include | ||
# the lib prefix of their name. | ||
# | ||
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# s.framework = "SomeFramework" | ||
# s.frameworks = "SomeFramework", "AnotherFramework" | ||
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# s.library = "iconv" | ||
# s.libraries = "iconv", "xml2" | ||
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# ――― Project Settings ――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # | ||
# | ||
# If your library depends on compiler flags you can set them in the xcconfig hash | ||
# where they will only apply to your library. If you depend on other Podspecs | ||
# you can include multiple dependencies to ensure it works. | ||
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# s.requires_arc = true | ||
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# s.xcconfig = { "HEADER_SEARCH_PATHS" => "$(SDKROOT)/usr/include/libxml2" } | ||
# s.dependency "JSONKit", "~> 1.4" | ||
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end |
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