objective-c - How to put escape sequence in Objective C?

Question

I have this small code:

NSString *size = [LabelNewContent stringByEvaluatingJavaScriptFromString:@"return     Math.max(
document.body.scrollHeight, document.documentElement.scrollHeight,
document.body.offsetHeight, document.documentElement.offsetHeight,
document.body.clientHeight, document.documentElement.clientHeight
);"];

the problem is xcode doesnt recognize the parentheses and commas as a whole string.

Answer 1

用于\使其成为多行字符串

NSString *size = [LabelNewContent stringByEvaluatingJavaScriptFromString:@"return     Math.max(\
document.body.scrollHeight, document.documentElement.scrollHeight,\
document.body.offsetHeight, document.documentElement.offsetHeight,\
document.body.clientHeight, document.documentElement.clientHeight\
);"];

Answer 2

NSString *size = [LabelNewContent stringByEvaluatingJavaScriptFromString:@"return     Math.max/(document.body.scrollHeight, document.documentElement.scrollHeight,document.body.offsetHeight, document.documentElement.offsetHeight,   document.body.clientHeight, document.documentElement.clientHeight);"];

试试上面的东西

Answer 3

将您的代码替换为

NSString *size = [LabelNewContent stringByEvaluatingJavaScriptFromString:@"return %f",Math.max(
                      document.body.scrollHeight, document.documentElement.scrollHeight,
                      document.body.offsetHeight, document.documentElement.offsetHeight,
                      document.body.clientHeight, document.documentElement.clientHeight
                      )];

希望它会帮助你。