holysin

+ (NSInteger)daysBetweenDate:(NSDate*)fromDateTime andDate:(NSDate*)toDateTime
{
    NSDate *fromDate;
    NSDate *toDate;

    NSCalendar *calendar = [NSCalendar currentCalendar];

    [calendar rangeOfUnit:NSDayCalendarUnit startDate:&fromDate
        interval:NULL forDate:fromDateTime];
    [calendar rangeOfUnit:NSDayCalendarUnit startDate:&toDate

holysin

typedef NS_ENUM(NSInteger, UITableViewCellStyle) {
    UITableViewCellStyleDefault,
    UITableViewCellStyleValue1,
    UITableViewCellStyleValue2,
    UITableViewCellStyleSubtitle
};

holysin

UIColor* color()
{
    CGFloat hue = ( arc4random() % 256 / 256.0 );  //  0.0 to 1.0
    CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from white
    CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from black
    return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
}

holysin

@interface UIColor (fromHex)
+ (UIColor *)colorwithHexString:(NSString *)hexStr alpha:(CGFloat)alpha;
@end

holysin

void PrintObjectMethods() {
unsigned int count = 0;
Method *methods = class_copyMethodList([NSObject class], &count);
  for (unsigned int i = 0; i < count; ++i) {
    SEL sel = method_getName(methods[i]);
      const char *name = sel_getName(sel);
      printf(“%s\n”, name);
  }
  free(methods);
}

holysin

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>People</key>
	<array>
		<string>😄</string>
		<string>😃</string>
		<string>😀</string>
		<string>😊</string>

holysin

UIFont * GetVariationOfFontWithTrait(UIFont *baseFont, CTFontSymbolicTraits trait) {
    CGFloat fontSize = [baseFont pointSize];
    CFStringRef baseFontName = (__bridge CFStringRef)[baseFont fontName];
    CTFontRef baseCTFont = CTFontCreateWithName(baseFontName, fontSize, NULL);
    CTFontRef ctFont = CTFontCreateCopyWithSymbolicTraits(baseCTFont, 0, NULL, trait, trait);
    NSString *variantFontName = CFBridgingRelease(CTFontCopyName(ctFont, kCTFontPostScriptNameKey));
    UIFont *variantFont = [UIFont fontWithName:variantFontName size:fontSize];
    CFRelease(ctFont);
    CFRelease(baseCTFont);
    return variationFont;

holysin

unsigned int countOfCores() {
  unsigned int ncpu;
  size_t len = sizeof(ncpu);
  sysctlbyname(“hw.ncpu”, &ncpu, &len, NULL, 0);
  return ncpu;
}

holysin

#import <QuartzCore/QuartzCore.h>

@interface CALayer (RNAnimations)

- (void)setValue:(id)value forKeyPath:(NSString *)keyPath duration:(CFTimeInterval)duration delay:(CFTimeInterval)delay;

@end

holysin

#define IS_IPHONE_5 ([[UIScreen mainScreen] bounds].size.height == 568 )
#define SYSTEM_VERSION ([[[UIDevice currentDevice] systemVersion] floatValue])
#define IS_IOS7_ORLATER (SYSTEM_VERSION >= 7.0)
#define SYSTEM_CALL(TEL) ([[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"telprompt://%@", (TEL)]]])

#define kAppDelegate ((AppDelegate *)[[UIApplication sharedApplication] delegate])

#define NavigationBar_HEIGHT 44
#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)
#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)