Objective-c – Add UIView on UIViewController

addobjective cuiviewuiviewcontroller

I want to add a "custom" uiview onto a uiviewcontroller, this custom view i created with xib and its a seperate from the view controller,

does anyone know how to add a uiview with a xib into a uiviewcontroller?

Many thanks in advance

Best Answer

You mean an additional view, not the main controller view? In that case you can declare a property for the view and load the NIB by hand:

@interface Controller {}
@property(retain) IBOutlet UIView *extraView;
@end

…

- (void) viewDidLoad // or anywhere else
{
    [[NSBundle mainBundle] loadNibNamed:@"extras" owner:self options:nil];
    NSAssert(extraView != nil, @"The extra view failed to load.");
    [[self view] addSubview:extraView];
}

This assumes that you set the Controller as the file owner in the Interface Builder and you link the view to the extraView outlet. Also note that there might be more elegant solutions, like inserting the extra view into the main NIB for your controller; depends on the situation.

Compare method

Either you implement a compare-method for your object:

- (NSComparisonResult)compare:(Person *)otherObject {
    return [self.birthDate compare:otherObject.birthDate];
}

NSArray *sortedArray = [drinkDetails sortedArrayUsingSelector:@selector(compare:)];

NSSortDescriptor (better)

or usually even better:

NSSortDescriptor *sortDescriptor;
sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"birthDate"
                                           ascending:YES];
NSArray *sortedArray = [drinkDetails sortedArrayUsingDescriptors:@[sortDescriptor]];

You can easily sort by multiple keys by adding more than one to the array. Using custom comparator-methods is possible as well. Have a look at the documentation.

Blocks (shiny!)

There's also the possibility of sorting with a block since Mac OS X 10.6 and iOS 4:

NSArray *sortedArray;
sortedArray = [drinkDetails sortedArrayUsingComparator:^NSComparisonResult(Person *a, Person *b) {
    return [a.birthDate compare:b.birthDate];
}];

Performance

The -compare: and block-based methods will be quite a bit faster, in general, than using NSSortDescriptor as the latter relies on KVC. The primary advantage of the NSSortDescriptor method is that it provides a way to define your sort order using data, rather than code, which makes it easy to e.g. set things up so users can sort an NSTableView by clicking on the header row.

Objective-c – How to create a basic UIButton programmatically

Here's one:

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button addTarget:self 
           action:@selector(aMethod:)
 forControlEvents:UIControlEventTouchUpInside];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[view addSubview:button];

Best Answer

Related Solutions

Ios – How to sort an NSMutableArray with custom objects in it

Compare method

NSSortDescriptor (better)

Blocks (shiny!)

Performance

Objective-c – How to create a basic UIButton programmatically

Related Topic