mthongvanh

//  Problem: Collection View data does not appear after calling [UICollectionView reloadData] in [PFQuery findObjectsInBackgroundBlock:]
//  Symptoms: The correct number returns in numberOfItems: but cellForItem: is never called
//  Solution: Try performing collection view updates manually via performBatchUpdates: or reloadItemsAtIndexPaths: or reloadSectionsAtIndexSet:

- (void)queryForPhoto {
    NSLog(@"%s", __PRETTY_FUNCTION__);
    
    PFQuery *query = [PFQuery queryWithClassName:@"Image"];
    PFUser *user = [PFUser currentUser];
    [query whereKey:@"user" equalTo:user];

mthongvanh

// Intent: Create a 7-Column collection view where the first and last column are wider than the middle columns
// Solution: Via the UICollectionViewDeleateFlowLayout calculate the correct size of the cells

const NSUInteger daysInWeek = 7;
const CGFloat cellHeight = 54.f;
const CGFloat sizeRatioForWeekStartEnd = 0.20;
const CGFloat sizeRatioForMiddleDays = (1 - (2 * sizeRatioForWeekStartEnd)) / (daysInWeek - 2);

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    CGSize cellSize = CGSizeZero;

mthongvanh

// Problem: AVAudioRecorder failed to initialize by crashing on initialization method
// Diagnosis: NSURL *audioURL was nil at audioRecorder initiliazation point because audioURL's weak declaration
// Solution: Declare NSURL *audioURL as strong to ensure it does not get deallocated prematurelys. 
// *Side note suggestion: Be sure to use [AVAudioRecorder record] instead of prepareToRecord since record will call it implicitly
//  and handle errors appropriately!

// properties
// @property (weak, nonatomic) NSURL *audioURL; /* User's original declaration */
@property (strong, nonatomic) NSURL *audioURL;
@property (strong, nonatomic) AVAudioRecorder *audioRecorder;

mthongvanh

- (void)willTransitionToTraitCollection:(UITraitCollection *)newCollection withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
    [super willTransitionToTraitCollection:newCollection withTransitionCoordinator:coordinator];
    
    NSLog(@"nav size %@", NSStringFromCGRect(self.navigationController.navigationBar.bounds));
}

mthongvanh

enum PersonDescription {
    case Singular, Dual, Plural
    
    struct Portrayal {
        var literal: String, numeral: Int
    }
    
    var portrayal: Portrayal {
        switch self {
        case .Singular:

mthongvanh

#import "DynamicScrollviewResizingViewController.h"

@interface DynamicScrollviewResizingViewController ()
@property (weak, nonatomic) IBOutlet UILabel *dynamicLabel;
@end

@implementation DynamicScrollviewResizingViewController

- (void)viewDidLoad {
    [super viewDidLoad];

mthongvanh

// In both versions, we're feeding a string to the NSFileManager method, but only the second one succeeds. In the debugger console, they both appeared with the file:// so it was a bit difficult to debug. Of course, I'd momentarily forgot about every. other. time. it has happened.

// Version 1
- (BOOL)fileExistsInCaches:(NSString *)filename
{
    NSString *path = [NSString stringWithFormat:@"%@%@",[self cacheDirectory],filename];
    // path = file://Users/mthongvanh/etc/etc/etc
    return [[NSFileManager defaultManager] fileExistsAtPath:path];
}

mthongvanh

Debug Log Statement
----------------------
DLog(@"\n<#debugging message#> <#%@#>",<#args#>);

NSString Convenience Method
----------------------------
[NSString stringWithFormat:@"<#%@#>",<#args#>]

Dispatch Asynchronously on Main Queue
-------------------------------------

mthongvanh

{
	"agendaFilters": [{
			"id": 1,
			"display": "Conferences",
			"value": "conferences",
			"valueType": "decisionTree",
			"filterType": "",
			"options": [{
				"id": 1,
				"display": "Ellucian Live",