检查对象实例的属性是否为"空白"

Question

我试图实现下面的代码,但没有成功.基本上,我想设置显示名称,thisPhoto.userFullName如果它不是'空白',否则显示thisPhoto.userName.

UILabel *thisUserNameLabel = (UILabel *)[cell.contentView viewWithTag:kUserNameValueTag];

NSLog(@"user full name %@",thisPhoto.userFullName);
NSLog(@"user name %@",thisPhoto.userName);
if (thisPhoto.userFullName && ![thisPhoto.userFullName isEqual:[NSNull null]] ) 
{
   thisUserNameLabel.text = [NSString stringWithFormat:@"%@",thisPhoto.userFullName];
}
else if (thisPhoto.userFullName == @"")
{
   thisUserNameLabel.text = [NSString  stringWithFormat:@"%@",thisPhoto.userName];
}

目前,即使userFullName是空白,我userName仍然没有显示在屏幕上.

Answer 1

我更喜欢

if([thisPhoto.userFullName length])