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-(void)click:(UIButton *)btn
{
NSString *testStr = @"学>与全等";
NSStringEncoding encoding2 = NSUTF8StringEncoding;
testStr = [testStr stringByReplacingOccurrencesOfString:@"\t" withString:@""];
testStr = [testStr stringByReplacingOccurrencesOfString:@"\x15" withString:@""];
testStr = [testStr stringByTrimmingCharactersInSet:[NSCharacterSet controlCharacterSet]];
testStr = [testStr stringByTrimmingCharactersInSet:[NSCharacterSet controlCharacterSet]];
testStr = [testStr stringByTrimmingCharactersInSet:[NSCharacterSet illegalCharacterSet]];
testStr = [testStr stringByTrimmingCharactersInSet:[NSCharacterSet symbolCharacterSet]];
testStr = [testStr stringByTrimmingCharactersInSet:[NSCharacterSet nonBaseCharacterSet]];
testStr = [testStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSMutableString *newStr = [[NSMutableString alloc]initWithCapacity:1];
for (int i = 0; i < [testStr length]; i++) {
unichar c = [testStr characterAtIndex:i];
if(c>=0 && c<=31)
{
continue;
}
[newStr appendString:[NSString stringWithFormat:@"%@", [testStr substringWithRange:NSMakeRange(i, 1)]]];
int bytesLeng = [[testStr substringWithRange:NSMakeRange(i, 1)] lengthOfBytesUsingEncoding:encoding2];
NSLog(@"testStr[%d]=%@ = %d,%d", i, [testStr substringWithRange:NSMakeRange(i, 1)], c, bytesLeng);
}
NSLog(@"%@=%d, %@=%d", testStr, [testStr length], newStr, [newStr length]);
}
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原文地址：http://www.cnblogs.com/xiangjune/p/5600601.html
