Objective C 代码片段(类别)

@interface NSString (reverse)

-(NSString *) reverseString;

@end

@implementation NSString (reverse)
 
-(NSString *) reverseString {
    int length = [self length];
    NSMutableString *reversedString;
    
    reversedString = [[NSMutableString alloc] initWithCapacity: length];
    
    while(length > 0) {
        [reversedString appendString:[NSString stringWithFormat:@"%C", [self characterAtIndex:--length]]];
    }
    return [reversedString autorelease]; 
}    
 @end