苹果全面屏(iphoneXR/XS/XS Max)适配和一些经常使用宏定义

iPhone X 375 * 812 width = 1125, height = 2436安全 iPhone XS 375 * 812 width = 1125, height = 2436dom iPhone XS Max 414 * 896 width = 1242, height = 2688debug iPhone XR 414 * 896 width = 828, height = 1

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