【IOS】判斷字串為空白和只為空白格解決辦法

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 1 + (BOOL)isBlankString:(NSString *)string    2 { 3     if (string == nil)  4     { 5         returnYES; 6     } 7     if (string == NULL)  8     { 9         returnYES;10     }11     if ([string isKindOfClass:[NSNullclass]]) 12     {13         returnYES;14     }15     if ([[string stringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet]] length]==0) 16     {17         returnYES;18     }19     returnNO;20 }21 22 23 24 +(Boolean) isEmptyOrNull:(NSString *) str 25 {26 27     if (!str) 28     {29 30         // null object31 32         return YES;33 34     } 35     else 36     {37 38         NSString *trimedString = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];39 40         if ([trimedString length] == 0) 41         {42 43             // empty string44 45             return YES;46 47         } 48         else 49         {50 51             // is neither empty nor null 52 53             return NO;54 55         }56 57     }58 }

 

【IOS】判斷字串為空白和只為空白格解決辦法