IOS checks whether the array is empty, and iOS checks the Array

IOS checks whether the array is empty, and iOS checks the Array

 

Some people say that it is possible to use ([array count] = 0) to determine whether it is null. It is a pitfall. If array is empty, an error will be reported directly when count is executed, and the program crashes and exits.

Correct method for determining whether NSArray is null: Use (! Array)

 

IF (Array! = Nil &&! [Array isKindOfClass: [NSNullClass] & Array. count! =0){

// Execute the operation when array is not empty

}

 

This is the correct way for iOS to determine whether the array is empty.