苹果官方印象

So, why is being a wise woman such a royal pain in the arse?

Because, inevitably, something will go wrong. And when that moment arrives, you’re screwed.

审视苹果的官方文档给我的感觉是，它并不是适合你去细细琢磨，而是非常适合当你有一个大致轮廓后，填补空白的轮廓的时候用。

所以，应该是文档结合demo 一起去学习，才能激发自己思考的动力

我想淡定的写完心里的怒气：

苹果文档，你把重要的信息突出一下会死！

The clockwise parameter determines the direction in which the arc is created;

the actual direction of the final path is dependent on the current transformation matrix of the graphics context.

For example, on iOS, a UIView flips the Y-coordinate by scaling the Y values by -1. In a flipped coordinate system, specifying a clockwise arc results in a counterclockwise arc after the transformation is applied.

Apple ID : 为您的 App 自动生成的 ID。

SKU : 您 App 专有的 ID, 此 ID 不会在 App Store 中显示。

套装 ID : 必须与您在 Xcode 中使用的 ID 相符。该 ID 在您上传第一个构建版本后便无法更改。

跟应用内使用的app id 一致，它包含了 Name ＋ App ID

UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge | UIUserNotificationTypeAlert | UIUserNotificationTypeSound categories:nil];

[[UIApplication sharedApplication] registerUserNotificationSettings:settings];

deprecated