‘invalid context 0x0’ error when using CGContext* functions

非 Y 不嫁゛ 提交于 2019-11-28 01:19:17

For your code to work, it needs to be executed in the drawRect method of your UIView subclass (and you don't call drawRect directly - this is called by the OS when it needs the UIView to render itself). You're presumably trying to run this code from a touch event or from viewDidLoad or something like that.

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