Sab.J 的碼農世界

NSString類別裡，總共有三種切字串的方法
1. - (NSString *)substringFromIndex:(NSUInteger)anIndex
2. - (NSString *)substringToIndex:(NSUInteger)anIndex
3. - (NSString *)substringWithRange:(NSRange)aRange

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NSString *str = @"1234567890";  
NSLog(@"Original String: %@", str);  
NSLog(@"substringFromIndex: 5 ==> %@", [str substringFromIndex:5]);  
NSLog(@"substringToIndex: 5 ==> %@", [str substringToIndex:5]);  
NSLog(@"substringWithRange: from 7, length 3 ==> %@", [str substringWithRange:NSMakeRange(7, 3)]);