IOS ----- class and object, nil/Nil/NULL, ios ----- nil

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GCD thread deadlock GCD is really easy to use and powerful. Compared with NSOpretion, GCD cannot cancel tasks. If such a powerful tool is used badly, a thread deadlock may occur. The following code: - (void)viewDidLoad{ [super viewDidLoad];

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IOS development-Where can I update the location information of the custom view subviews? (DrawRect: Or layoutSubviews ?), Subviewsdrawrect

IOS development-Where can I update the location information of the custom view subviews? (DrawRect: Or layoutSubviews ?), Subviewsdrawrect For custom, you can add content through addSubview or draw content through Core Graphic.   For the latter,

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IOS --- There was an internal API error, iosinternalerror There was an internal API error. Cause of error: the Product Name is used as the program Name, and the program Name is out of order. Solution: Check the Product Name. Do not include Chinese

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Simple use of iOS NSNotificationCenter Register the notification in two parts of the project. One is AppDelegate, which simulates the processing of notifications received in the background, and the other is ViewController, which simulates the

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