비교하는 방법 "<null>"문자열?

Question

"null"을 표시하는 문자열 일부이 오류를 어떻게 확인할 수 있습니까? 경우 (이미지 URL == (ID) NSNull 널]) {

}

Answer 1

이보십시오.

if ([imageUrl isKindOfClass:[NSString class]]) { 
        [_profileImageView sd_setImageWithURL:[NSURL URLWithString:imageUrl] placeholderImage:[UIImage imageNamed:@"PlaceHoldeImage"]]; 


    }else{ 
     _profileImageView.image=[UIImage imageNamed:@"PlaceHoldeImage"]; 


    } 

Answer 2

NSString *imageUrl= [ProfileArray valueForKey:@"photo"]; 

if ([imageUrl isKindOfClass:[NSNull class]]) 
{ 
    _profileImageView.image=[UIImage imageNamed:@"PlaceHoldeImage"]; 
} 
else 
{      
    [_profileImageView sd_setImageWithURL:[NSURL URLWithString:imageUrl] placeholderImage:[UIImage imageNamed:@"PlaceHoldeImage"]]; 
} 
_profileImageView.image=[UIImage imageNamed:@"PlaceHoldeImage"]; 

Answer 3

사용이 코드. 그것은 확실히 작동해야합니다.

NSString *imageUrl= [ProfileArray valueForKey:@"photo"]; 
    if ([imageUrl isKindOfClass:[NSNull class]]) { 
     _profileImageView.image=[UIImage imageNamed:@"PlaceHoldeImage"]; 
    } else { 
     [_profileImageView sd_setImageWithURL:[NSURL URLWithString:imageUrl] placeholderImage:[UIImage imageNamed:@"PlaceHoldeImage"]]; 
    } 

Answer 4

이 코드를 사용해보십시오.

NSString *imageUrlString= [photoDict valueForKey:@"photo"]; 
if (imageUrl.length == 0) 
{ 
    _profileImageView.image=[UIImage imageNamed:@"PlaceHoldeImage"]; 
} 
else 
{ 
    _profileImageView.image=[UIImage imageNamed:imageUrlString]; 
}