UISwitch不返回其当前状态（开/关）(UISwitch not returning its current state (on/off))

 下面是通过valueChanged事件链接到UISwitch的IBAction方法： 
 
- (IBAction) sanitySwitch {
if (checkoption.on == YES) {
    NSLog(@"SanityCheck ENABLED");
    sanityCheck = YES;
} else {
    NSLog(@"SanityCheck DISABLED");
    sanityCheck = NO;
}
}
 
 它总是返回“SanityCheck DISABLED”。 UISwitch checkoption正确地连接到XIB文件中的对象，并且已经放置了正确的@propery和@syntetize设置。 

Here is the IBAction method linked to the UISwitch with the valueChanged event :
 
- (IBAction) sanitySwitch {
if (checkoption.on == YES) {
    NSLog(@"SanityCheck ENABLED");
    sanityCheck = YES;
} else {
    NSLog(@"SanityCheck DISABLED");
    sanityCheck = NO;
}
}
 
It always returns "SanityCheck DISABLED". The UISwitch checkoption is correcty linked to its object from the XIB file and proper @propery and @syntetize setting have been placed.

原文：https://stackoverflow.com/questions/3715531