iOS7風格的聯系人選擇器：MBContactPicker

MBContactPicker 是一個iOS7風格的聯系人選擇器，可作為一個UICollectionView ，實現類似 iOS 7 的本地郵件聯系人選擇器的功能。

#import "ViewController.h"
#import "ContactObject.h"
#import "MBContactPicker.h"

@interface ViewController () <MBContactPickerDataSource, MBContactPickerDelegate>

@property (nonatomic) NSArray *contacts;
@property (weak, nonatomic) IBOutlet MBContactPicker *contactPickerView;
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *contactPickerViewHeightConstraint;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSArray *array = @[
                       @{@"Name":@"Contact 1", @"Title":@"CTO"},
                       @{@"Name":@"Contact 2", @"Title":@"CEO"}
                       ];

    NSMutableArray *contacts = [[NSMutableArray alloc] initWithCapacity:array.count];
    for (NSDictionary *contact in array)
    {
        ContactObject *model = [[ContactObject alloc] init];
        model.contactTitle = contact[@"Name"];
        model.contactSubtitle = contact[@"Title"];
        [contacts addObject:model];
    }
    self.contacts = contacts;

    self.contactPickerView.delegate = self;
    self.contactPickerView.datasource = self;
}

#pragma mark - MBContactPickerDataSource

// Use this method to give the contact picker the entire set of possible contacts.  Required.
- (NSArray *)contactModelsForContactPicker:(MBContactPicker*)contactPickerView
{
    return self.contacts;
}

// Use this method to pre-populate contacts in the picker view.  Optional.
- (NSArray *)selectedContactModelsForContactPicker:(MBContactPicker*)contactPickerView
{
    return @[];
}

#pragma mark - MBContactPickerDelegate

// Optional
- (void)contactCollectionView:(MBContactCollectionView*)contactCollectionView didSelectContact:(id<MBContactPickerModelProtocol>)model
{
    NSLog(@"Did Select: %@", model.contactTitle);
}

// Optional
- (void)contactCollectionView:(MBContactCollectionView*)contactCollectionView didAddContact:(id<MBContactPickerModelProtocol>)model
{
    NSLog(@"Did Add: %@", model.contactTitle);
}

// Optional
- (void)contactCollectionView:(MBContactCollectionView*)contactCollectionView didRemoveContact:(id<MBContactPickerModelProtocol>)model
{
    NSLog(@"Did Remove: %@", model.contactTitle);
}

// Optional
// This delegate method is called to allow the parent view to increase the size of
// the contact picker view to show the search table view
- (void)didShowFilteredContactsForContactPicker:(MBContactPicker*)contactPicker
{
    if (self.contactPickerViewHeightConstraint.constant <= contactPicker.currentContentHeight)
    {
        [UIView animateWithDuration:contactPicker.animationSpeed animations:^{
            CGRect pickerRectInWindow = [self.view convertRect:contactPicker.frame fromView:nil];
            CGFloat newHeight = self.view.window.bounds.size.height - pickerRectInWindow.origin.y - contactPicker.keyboardHeight;
            self.contactPickerViewHeightConstraint.constant = newHeight;
            [self.view layoutIfNeeded];
        }];
    }
}

// Optional
// This delegate method is called to allow the parent view to decrease the size of
// the contact picker view to hide the search table view
- (void)didHideFilteredContactsForContactPicker:(MBContactPicker*)contactPicker
{
    if (self.contactPickerViewHeightConstraint.constant > contactPicker.currentContentHeight)
    {
        [UIView animateWithDuration:contactPicker.animationSpeed animations:^{
            self.contactPickerViewHeightConstraint.constant = contactPicker.currentContentHeight;
            [self.view layoutIfNeeded];
        }];
    }
}

// Optional
// This delegate method is invoked to allow the parent to increase the size of the
// collectionview that shows which contacts have been selected. To increase or decrease
// the number of rows visible, change the maxVisibleRows property of the MBContactPicker
- (void)contactPicker:(MBContactPicker*)contactPicker didUpdateContentHeightTo:(CGFloat)newHeight
{
    self.contactPickerViewHeightConstraint.constant = newHeight;
    [UIView animateWithDuration:contactPicker.animationSpeed animations:^{
        [self.view layoutIfNeeded];
    }];
}

@end