Property cannot be found on forward class object?

问题:

I have a UIView and I'm trying to set its layer properties.

self.colorSwatch = [[UIView alloc] initWithFrame:CGRectMake(400, 150, 100, 100)]; self.colorSwatch.layer.cornerRadius = 8; 

However, when I try to access the .layer.cornerRadius property, I get a warning that says "Property 'cornerRadius' cannot be found in forward class object 'CALayer *'.

What does this mean? Thanks

回答1:

It doesn't know what type of object the layer property is. Add #import to the top of your file.

回答2:

You need to import the file #import < QuartzCore/QuartzCore.h> in ViewController.m class if and only if xcode version is less than 5.

See if you are using xcode version 5 or latest than that then not required to import .It is automatically included.

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