NSString方法stringByTrimmingCharactersInSet:不修剪逗号

Question

我有以下代码从表示数字的一些字符串中删除多余的字符:

NSCharacterSet *charactersToKeep = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
NSCharacterSet *charactersToBeRemoved = [charactersToKeep invertedSet];

NSString *myString = [dictionary objectForKey:@"MyKey"];
myString = [myString stringByTrimmingCharactersInSet:charactersToBeRemoved];
myString = [myString stringByReplacingOccurrencesOfString:@"," withString:@""];

在该方法之后stringByTrimmingCharactersInSet:,除去逗号之外的所有额外字符.stringByReplacingOccurencesOfString:删除对逗号的调用后.第一次通话后为什么不删除它？

以下是每行代码后myString的示例:

myString = " $9,959 "
myString = "9,959"
myString = "9959"

我也试过了

NSCharacterSet *charactersToBeRemoved = [NSCharacterSet decimalDigitCharacterSet];

并得到了相同的结果.

Answer 1

stringByTrimmingCharactersInSet:仅修剪字符串末尾的字符,而不是内部.