Note When using IOS xib

The usual steps to use for 1.xib

1.1 Create a new 1 class to describe this xib (assuming that it inherits from UIView and the class name is Diyview)

1.2 New 1 Xib, file name is also Diyview, drag a uiview inside, set the UIView property-class for Diyview

1.3 Drag 1 long press gesture recognition to xib, right mouse button just dragged in uiview,gesture recognizer and just dragged in the long press gesture recognition to do the connection

1.4 DIYView.h provides a method class method: + (instancetype) Diyview;

DIYVIEW.M Implementation Diyview:

+ (Instancetype) Diyview

{

return [[[NSBundle Mainbundle] loadnibnamed:@ "Diyview" Owner:nil Options:nil] lastobject];

}

1.5 in the controller, add the view defined by the Xib

Diyview *diy = [Diyview Diyview];

[Self.view Addsubview:diy];

1.6 Last Run program, program crashes

1.7 Analysis of the cause of the error:

[Diyview Diyview] Returns a gesture, not an expected uiview. Because the last addition is a long-press gesture.

1.8 Summary:

When using Xib, pay attention to what lastobject or Firstobject returns.

1.9 Circumvention Methods

You can print an array to see the order of the elements in the array

Nsarray *array = [[NSBundle mainbundle] loadnibnamed:@ "Diyview" Owner:nil Options:nil]

NSLog (@ "%@", array);

Note When using IOS xib