判斷NSString字符串或NSArray數組是否爲空

一、宏定義

1.字符串

#define NULLString(string) ((![string isKindOfClass:[NSString class]])||[string isEqualToString:@""] || (string == nil) || [string isEqualToString:@""] || [string isKindOfClass:[NSNull class]]||[[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length]==0)

2.數組

#define NULLArray(array) ((array == nil)||[array isKindOfClass:[NSNull class]]||array.count ==0)

二、自定義方法

1.字符串

+ (BOOL)isBlankString:(NSString *)string{

    //字符串的長度爲0表示空串
    if (string.length == 0) {
        return YES;
    }
    if (string == nil) {
        return YES;
    }

    if (string == NULL) {
        return YES;
    }

    if ([string isEqualToString:@""]) {
        return YES;
    }
    if ([string isKindOfClass:[NSNull class]]) {
        return YES;
    }

    if ([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] length]==0) {
        return YES;
    }
    return NO;
}

2.數組

+ (BOOL)isBlankArray:(NSArray *)array{

    if (array == nil) {
        return YES;
    }

    if ([array isKindOfClass:[NSNull class]]) {
        return YES;
    }

    if (array.count == 0) {
        return YES;
    }

    return NO;
}