MRo Blog

Loading UIImages automatically in high-resolution works fine for locally stored images – but if you want to fetch them via remote URL you have to code yourself.

A simple, blocking but backward compatible (iOS >= 3.0, maybe even 2.0 but untested)  implementation could look like this:
@implementation UIImage (MRORemote)

// add the @2x filename suffix
+(NSURL *)url2x:(NSURL …

UILabel’s font property accepts UIFonts – but strange enough there’s no way to get a custom loaded CGFont (from a ttf or otf file) converted into such an UIFont. You’re stuck with the iPhone’s pre-installed fonts – at least when you have to support iOS 3.0 devices.

After googling a bit and searching Stackoverflow I found …

Though CFArray comes with binary search capability, NSArray does not – at least not within the iPhone SDK. The indexOfObject:inSortedRange:options:usingComparator: can’t be found.

Plus the CFArrayBSearchValues doesn’t tell you whether the key actually is part of the list or not. That’s what the Java JDK does, so let’s implement some category methods
-(NSInteger)binarySearch:(id)key;
-(NSInteger)binarySearch:(id)key usingSelector:(SEL)comparator;
-(NSInteger)binarySearch:(id)key usingSelector:(SEL)comparator inRange:(NSRange)range;
-(NSInteger)binarySearch:(id)key …

The base for many of my SELECT-ish queries when querying by exact match is one generic method I created in some category methods on NSManagedObjectContext:
-(NSArray*)entityName:(NSString*)entityName findManyByRelation:(NSDictionary*)dict
{
// TODO handle dict nil and emptyness
NSMutableArray *arr = initWithCapacity:dict.count];
for(NSString *key in dict)
{
…