iOS pch中定义使用宏定义函数和代码块

一、objective-C项目pch文件中定义函数和代码块

• 使用宏定义函数实现

//定义
#define SendNotification @"SendNotification"
#define sendMessage(msg) \
({\
dispatch_async(dispatch_get_main_queue(), ^{\
    NSNotificationCenter* notificationCenter = [NSNotificationCenter defaultCenter];\
    [notificationCenter postNotificationName:SendNotification object:nil userInfo:@{@"msg":msg}];\
    });\
})

//使用
sendMessage(@"发个消息试试");

//有返回的宏函数定义
#define getSum(a,b) \
({\
(a+b);\
})

//使用
double sum = getSum(M_PI,M_E);

//定义状态栏高度
#define kStatusBarHeight \
({\
    @available(iOS 13.0, *) ? [[[UIApplication sharedApplication] windows] objectAtIndex:0].windowScene.statusBarManager.statusBarFrame.size.height : [[UIApplication sharedApplication] statusBarFrame].size.height;\
})

//使用
kStatusBarHeight

• 使用宏定义代码块实现

//定义
#define SendNotification @"SendNotification"
#define sendMessage(msg) \
^(){\
    dispatch_async(dispatch_get_main_queue(), ^{\
        NSNotificationCenter* notificationCenter = [NSNotificationCenter defaultCenter];\
        [notificationCenter postNotificationName:SendNotification object:nil userInfo:@{@"msg":msg}];\
    });\
}()

//使用
sendMessage(@"发个消息试试");

//有返回的宏代码块定义
#define getSum(a,b)\
^(){\
    return a+b;\
}()

//使用
double sum = getSum(M_PI,M_E);

//定义状态栏高度
#define kStatusBarHeight \
^(){\
 if (@available(iOS 13.0, *)) {\
     UIStatusBarManager *statusBarManager = [[[UIApplication sharedApplication] windows] objectAtIndex:0].windowScene.statusBarManager;\
     return statusBarManager.statusBarFrame.size.height;\
 }else{\
     return [[UIApplication sharedApplication] statusBarFrame].size.height;\
 }\
}()

//使用
kStatusBarHeight

二、swift项目中中定义函数

• 可参考Swift5-swift 自定义print

func kSafeAreaBottom() -> CGFloat {
    
    var kSafeAreaBottom: CGFloat = 0
    if #available(iOS 11.0, *) {
        kSafeAreaBottom = UIApplication.shared.keyWindow?.safeAreaInsets.bottom ?? 0
    } else {
        kSafeAreaBottom = 0
    }
    return kSafeAreaBottom
}

参考文章

iOS 使用宏定义函数和代码块