如何在目标C中放置转义序列？

Question

我有这个小代码：

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
);"];

问题是xcode不能将括号和逗号识别为整个字符串。

Answer 1

使用\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);"];

尝试上面的事情

Answer 3

用

代替你的代码

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
                      )];

希望它会对你有所帮助。