objective-c 如何检查 NSMutableArray 的实例是否为空
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时间：2020-09-03 22:44:50 来源:igfitidea点击:
How to check if an instance of NSMutableArray is null or not
提问by S.P.
How to check an NSMutableArrayis null or not ?
如何检查一个NSMutableArray是否为空？
回答by Alex Reynolds
If you want to check if it is empty:
如果要检查它是否为空：
if ([myMutableArray count] == 0) { ... }
If you want to check if the variable is nil:
如果要检查变量是否为nil：
if (!myMutableArray) { ... }
or:
或者：
if (myMutableArray == nil) { ... }
回答by S.P.
//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");
}
回答by saurabh rathod
There are multiple ways to check it.
有多种方法可以检查它。
if (array == [NSNull null]) { //myarray is blank }if(array.count==0) { //myarray is blank }if(array == nil) { //my array is blank }
if (array == [NSNull null]) { //myarray is blank }if(array.count==0) { //myarray is blank }if(array == nil) { //my array is blank }
回答by D.M
You can check this way also...
您也可以通过这种方式检查...
if self.yourMutableArray.count == 0 {
// Your Mutable array is empty.
} else {
// Your Mutable array is not empty.
}
