如何检查NSMutableArray的实例是否为null

Question

如何检查NSMutableArray是否为空？

Answer 1

如果你想检查它是否为空：

if ([myMutableArray count] == 0) { ... }

如果您想检查变量是否为nil：

if (!myMutableArray) { ... }

或：

if (myMutableArray == nil) { ... }

Answer 2

//if the array has a count of elements greater than 0, then the array contains elements
if(myarray.count>0){
    NSlog(@"myarray contains values/elements");
}
else{ //else the array has no elements
    NSlog(@"myarray is nil");
}

Answer 3

有多种方法可以检查它。

1. if (array == [NSNull null])
   {
       //myarray is blank
   }
   

2. if(array.count==0)
   {
       //myarray is blank
   }
   

3. if(array == nil)
   {
       //my array is blank
   }
   

Answer 4

你也可以这样检查......

if self.yourMutableArray.count == 0 {
     // Your Mutable array is empty. 
} else {
    // Your Mutable array is not empty.
}