问题描述
我正在尝试在界面方向更改时根据屏幕尺寸调整某些元素的大小。我已经在不同的地方阅读过（包括这里的一些答案），获取屏幕边界的方法是使用[[UIScreen] mainScreen] bounds]。所以我已添加此代码以查看其行为：
I'm trying to make certain elements resize according to the screen dimensions when the interface orientation changes. I've read in various places (including a few answers on here) that the way to get the bounds of the screen is to use [[UIScreen] mainScreen] bounds]. So I've added this code to see how it behaves:
- (void) willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
NSLog(@"view dimensions: (%@, %@)", [[UIScreen mainScreen] bounds].size.width, [[UIScreen mainScreen] bounds].size.height);
}
但是在运行它时，只要我旋转屏幕，我就会得到一个EXC_BAD_ACCESS信息。是否有一些关于willRotateToInterfaceOrientation函数的范围，它不允许我调用屏幕边界？如果是这样，我该怎么做？
But when running it, as soon as I rotate the screen I get an EXC_BAD_ACCESS message. Is there something about the scope of the willRotateToInterfaceOrientation function that doesn't allow me to call for the screen bounds? If so, how would I go about it?
推荐答案
％@ format说明符期望格式参数为objective-c对象，而你提供的是普通浮动。要打印浮点数，请使用％f 说明符：
%@ format specifier expects format parameter to be objective-c object, while what you provide is plain float. To print float numbers use %f specifier:
NSLog(@"view dimensions: (%f, %f)", [[UIScreen mainScreen] bounds].size.width, [[UIScreen mainScreen] bounds].size.height);
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