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Tuesday, 18 March 2014

How null,nill, and lenght 0 object can be checked ???

The simplest way to check NSNull value , nill value, and lenght =0 of object:

static inline BOOL IsEmpty(id object)
{
    return object == nil
    || ([object respondsToSelector:@selector(length)]
        && [(NSData *) object length] == 0)
    || ([object respondsToSelector:@selector(count)]
        && [(NSArray *) object count] == 0)
    || ([object respondsToSelector:@selector(count)]
        && object == nil)
    || ([object respondsToSelector:@selector(count)]
        && [ object isKindOfClass:[NSNull class]]);
    

}


How to call inline function:

 NSString *str =nil;
    
    if(!(IsEmpty(str)))
    {
        NSLog(@"The object is not null, nill,");

    }

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