IOS asc码替换

-(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]);

}