NSMutableDictionary setObject example in Objective C (iOS).

NSMutableDictionary setObject

Adds a given key-value pair to the dictionary.

- (void)setObject:(id)anObject forKey:(id < NSCopying >)aKey

Parameters of [NSMutableDictionary setObject]
anObject
The value for aKey. A strong reference to the object is maintained by the dictionary. Raises an NSInvalidArgumentException if anObject is nil. If you need to represent a nil value in the dictionary, use NSNull.
aKey
The key for value. The key is copied (using copyWithZone:; keys must conform to the NSCopying protocol). Raises an NSInvalidArgumentException if aKey is nil. If aKey already exists in the dictionary anObject takes its place.

NSMutableDictionary setObject example.

NSMutableDictionary* dict = [[NSMutableDictionary alloc] initWithDictionary:delegate.sharedData.dictFaves];
[dict setObject:@"test" forKey:@"4"];
delegate.sharedData.dictFaves = dict;
[dict release];

Example of [NSMutableDictionary setObject].

- (BOOL)addStudent:(Student *)newStudent
{
    NSLog(@"adding new student");
    if (studentStore == nil) {
        studentStore = [[NSMutableDictionary alloc] init];
    }
    [studentStore setObject:newStudent forKey:newStudent.adminNo];
    return YES;
}

NSMutableDictionary setObject example.

//NSMutableDictionary myDictionary = [[NSMutableDictionary alloc] init];
NSMutableDictionary *myDictionary = [[NSMutableDictionary alloc] init];

NSNumber *value = [myDictionary objectForKey:myWord];

if (value)
{
    NSNumber *nextValue = [NSNumber numberWithInt:[value intValue] + 1];
    [myDictionary setObject:nextValue  forKey:myWord];
}
else
{
    [myDictionary setObject:[NSNumber numberWithInt:1] forKey:myWord]
}

End of NSMutableDictionary setObject example article.

NSCache setObject example ios

setObject :forKey:

Sets the value of the specified key in the cache.

- (void)setObject:(id)obj forKey:(id)key

Parameters

obj

The object to be stored in the cache.

key

The key with which to associate the value.

Discussion of [NSCache setObject]

Unlike an NSMutableDictionary object, a cache does not copy the key objects that are put into it.

Example of [NSCache setObject]

id object = [NSString stringWithFormat:@"%lu", theIndex % 10];
id key = [NSString stringWithFormat:@"sdffffffff%lu", theIndex];

[self.cache setObject :object forKey:key];

Example of [NSCache setObject]

// Your cache should have a lifetime beyond the method or handful of methods
// that use it. For example, you could make it a field of your application
// delegate, or of your view controller, or something like that. Up to you.
NSCache *myCache = ...;
NSAssert(myCache != nil, @"cache object is missing");

// Try to get the existing object out of the cache, if it's there.
Widget *myWidget = [myCache objectForKey: @"Important Widget"];
if (!myWidget) {
    // It's not in the cache yet, or has been removed. We have to
    // create it. Presumably, creation is an expensive operation,
    // which is why we cache the results. If creation is cheap, we
    // probably don't need to bother caching it. That's a design
    // decision you'll have to make yourself.
    myWidget = [[[Widget alloc] initExpensively] autorelease];

    // Put it in the cache. It will stay there as long as the OS
    // has room for it. It may be removed at any time, however,
    // at which point we'll have to create it again on next use.
    [myCache setObject: myWidget forKey: @"Important Widget"];
}

// myWidget should exist now either way. Use it here.
if (myWidget) {
    [myWidget runOrWhatever];
}