items NSArray Objective-C

Question

ShinehahGnolaum OP

Created Jun ’16

Replies 1

Boosts 0

Participants 2

I have this code from the iPod Library Access Programming Guide: Using the iPod Library:

Listing 4-1 Creating and using a generic media query

MPMediaQuery *everything = [[MPMediaQuery alloc] init];

NSLog(@"Logging items from a generic query...");

NSArray *itemsFromGenericQuery = [everything items];

for (MPMediaItem *song in itemsFromGenericQuery) {

NSString *songTitle = [song valueForProperty: MPMediaItemPropertyTitle];

NSLog (@"%@", songTitle);

}

I am unclear about the line starting with "NSArray". "items" is not a declared identifier in the code. What is "items"? How do I translate that to Swift from Objective-C?

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Answer 1

DTS Engineer OP

Apple

Jun ’16

Accepted Answer

items

is a property of MPMediaQuery, so this code translates (roughly) as:

let everything = MPMediaQuery()
let itemsFromGenericQuery = everything.items!
for song in itemsFromGenericQuery {
    // …
}

In Objective-C the type of

itemsFromGenericQuery

is NSArray; in Swift that’s translated an

[MPMediaItem]

.

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