字符串_过滤处理NSCharacterSet 与invertedSet

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1. //有字符串“A~B^C_D>E"，拆分出单个字母:

NSString *str =@" A~B^C_D>E ";

str = [str stringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet]];//去掉前边和后边的空格

NSCharacterSet * charSet = [NSCharacterSetcharacterSetWithCharactersInString:@"^~_>"];

NSArray *arr = [strcomponentsSeparatedByCharactersInSet:charSet];

//输出看效果

[arr enumerateObjectsUsingBlock:^(id obj,NSUInteger idx,BOOL *stop) {

NSLog(@"A~B^C_D->[%@]", obj);

}];

2.//关于invertedSet

NSString *string =@" 123,45_6 7/8>9a ";

NSString * kNumber =@"0123456789.";

NSCharacterSet *numberSet = [[NSCharacterSetcharacterSetWithCharactersInString:kNumber]invertedSet];

//invertedSet方法是去反字符,把所有的除了kNumber里的字符都找出来(包含去空格功能)

NSString *fieldString = [[stringcomponentsSeparatedByCharactersInSet:numberSet]componentsJoinedByString:@""];

NSLog(@"number__[%@]", fieldString);

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