在iOS开发过程中, 我们可能会碰到一些系统方法弃用, weak、循环引用、不能执行之类的警告。 有代码洁癖的孩子们很想消除他们, 今天就让我们来一次Fuck 警告！！
首先学会基本的语句
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wgnu-conditional-omitted-operand"
这里写出现警告的代码
#pragma clang diagnostic pop
if (![s respondsToSelector:@selector(boundingRectWithSize:options:attributes:context:)]) {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
labelsize = [s sizeWithFont:font constrainedToSize:size lineBreakMode:NSLineBreakByWordWrapping];
#pragma clang diagnostic pop
} else {
NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[style setLineBreakMode:NSLineBreakByWordWrapping];
labelsize = [s boundingRectWithSize:size
options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
attributes:@{ NSFontAttributeName:font, NSParagraphStyleAttributeName : style}
context:nil].size;
}
