扭转BOOL

Question

在objective-c中,如果我想反转a的值,这BOOL会工作,还是会设置BOOLto 的值NO？

BOOL ab = YES;

ab = !ab; // would this reverse the BOOL, ab, and set it to NO?

if (ab == NO) {
    ab = !ab; // would this reverse the BOOL again and set it to YES?
}

Answer 1

是的,那会有效.BOOL只是一个整数.YES是1和NO是0.!1 == 0和!0 == 1.