为什么UIScreen的大小是iPhone本身的一半（以像素为单位）？
[英]Why is the size of my UIScreen half the size of the iPhone itself(in pixels)?
问题描述
So I have been programming in xCode, and I've found out where to position my SKSpriteNodes by printing my UIScreen.mainScreen().bounds.width/height . 
因此，我一直在使用xCode进行编程，并且通过打印UIScreen.mainScreen().bounds.width/height来确定将SKSpriteNodes在哪里。 For the iPhone 6, it prints 667 by 375, however the iPhone itself actually is double that, 1334 x 750. Why is this? 对于iPhone 6，它的输出为667 x 375，但是iPhone本身实际上是它的两倍，是1334 x750。为什么？
1 个解决方案
解决方案1
1 已采纳 2015-05-16 02:06:36
This is because size in iOS is calculated in points . 这是因为iOS的大小是以点为单位计算的 。 Depending on your screen pixel density, either the scale is 1, 2, or 3. 根据您的屏幕像素密度， scale为1、2或3。
Since an iPhone 4 is double the resolution of iPhone 3G but the UI elements must stay the same size, the iPhone 4 is set at a scale of 2, so if you make a 50x50 square, it appears the same size on both devices even though the true dimensions of the iPhone 4 square is at 100x100. 由于iPhone 4的分辨率是iPhone 3G的两倍，但UI元素必须保持相同的大小，因此iPhone 4的scale设置为2，因此，如果您将其设置为50x50的正方形，即使两个设备上的尺寸都相同 iPhone 4正方形的真实尺寸为100x100。
iPhone 6 uses a scale of 2 and iPhone 6 Plus uses a scale of 3. The beauty of this system is that you don't have to manage the apparent sizes of objects ; iPhone 6的缩放比例为2，iPhone 6 Plus的scale为3。该系统的优点在于， 您不必管理对象的外观大小 。 if you set the dimensions to 50x50 points, it will stay generally the same size across all devices. 如果将尺寸设置为50x50点，则在所有设备上尺寸通常保持相同。
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