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...It exposes both notifications and blocks so you can react to connectivity changes without polling. Typical usage is to gate network requests, disable online-only UI, and show graceful messaging when connectivity drops. The implementation is careful about threading and runloop scheduling so events arrive reliably without blocking the main thread. It also supports reachability checks for specific hosts, enabling smarter behavior than a simple “internet yes/no” toggle. Despite newer frameworks existing today, Reachability remains widely referenced for its simple API and predictable behavior in legacy Objective-C codebases.

...It depends on the following Apple frameworks, which should already be included with most Xcode templates, Foundation.framework, UIKit.framework, CoreGraphics.framework, and QuartzCore.framework. You will need LLVM 3.0 or later in order to build PNChart. CocoaPods is the recommended way to add PNChart to your project. You can choose to show smooth lines. You can set different colors for the same PNLineChartData item. for instance you can use "color" red for values less than 50 and use purple for values greater than 150. Legend has been added to PNChart for Line and Pie Charts. Legend items position can be stacked or in series.