Objective-C我可以访问self.view但不能访问self.view.frame

Question

我可以访问并显示self.view并在日志中查看框架,但是当我尝试访问self.view.frame时,我得到null.下面是日志输出

NSLog(@"Show self.view:%@",self.view);
NSLog(@"Show self.view.frame:%@",self.view.frame);

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2010-03-28 11:08:43.373 vivmed_CD_Tab[20356:207] Show self.view:<UITableView: 0x4001600; frame = (0 0; 320 583); clipsToBounds = YES; autoresize = W+H; layer = <CALayer: 0x3b21270>>
2010-03-28 11:08:43.373 vivmed_CD_Tab[20356:207] Show self.view.frame:(null)

谁能解释为什么self.view.frame是null却self.view显示帧？我的目标是改变框架大小.

干杯,格兰特

Answer 1

您发布的代码中的一个问题是您将框架(a CGRect)打印为对象,这将无法正常工作.尝试:

NSLog(@"Show self.view.frame: %u", self.view.frame);  // as a pointer

NSLog(@"Show self.view.frame: %@", NSStringFromCGRect(self.view.frame));  // as a string