//字符串反转
NSString *str = @"abcedfghijklmnopqrstuvwxyz";
NSMutableString *string = [NSMutableString stringWithCapacity:str.length];
int j = (int)str.length;
for (int i = j - 1; i>=0; i--) {
[string appendFormat:@"%c",[str characterAtIndex:i]];
}
NSLog(@"string is-- %@",string);输出如下：
string is-- zyxwvutsrqponmlkjihgfdecba
