Considerations for Array Usage

First, Nsarray and Nsmutablearray method difference 1, through the subscript obtained elements, only applicable to the Nsmutablearray error scene:

@property (nonatomic, Strong) Nsarray *departmentidsarray;[ Self.departmentidsarray Enumerateobjectsusingblock:^ (nsstring *departmentidstr, Nsuinteger idx, BOOL * _ Nonnull stop) {        if ([departmentidstr isequaltostring:@ "Uzg9"]) {         @"" ;         *stop = YES;    }}];

Error correcting:

@property (nonatomic, strong) Nsmutablearray *departmentidsarray;

When you define an array, you can declare the known types of the objects in the array, such as

-(nsarray<uitableviewrowaction *> *) TableView: (UITableView *) TableView editactionsindexpath{}

Assign an array (type strong) to another array (type strong) with an equal sign, resulting in a strong reference problem such as

Displaydocumentvc.folderallpatharr = disvc.folderallpatharr;[ Displaydocumentvc.folderallpatharr AddObject:companyFolderCell.DocumentModel.documentName];

Obviously is to add an object on Displaydocumentvc.folderallpatharr, but because of the role of strong reference, Disvc.folderallpatharr also added an object. And because Displaydocumentvc.folderallpatharr strong reference Disvc.folderallpatharr, so Disvc.folderallpatharr cannot release.

Considerations for Array Usage