paolonl

# Xcode
#
build/
*.pbxuser
!default.pbxuser
*.mode1v3
!default.mode1v3
*.mode2v3
!default.mode2v3
*.perspectivev3

paolonl

-(BOOL) NSStringIsValidEmail:(NSString *)checkString
{
   BOOL stricterFilter = YES; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
   NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";
   NSString *laxString = @".+@([A-Za-z0-9]+\\.)+[A-Za-z]{2}[A-Za-z]*";
   NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
   NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
   return [emailTest evaluateWithObject:checkString];
}

paolonl

- (UIImage *)rotateImage:(UIImage *)image ofAngle:(CGFloat)degrees {
    CGImageRef imgRef = image.CGImage;
  CGFloat angleInRadians = degrees * (M_PI / 180);
	CGFloat width = CGImageGetWidth(imgRef);
	CGFloat height = CGImageGetHeight(imgRef);
	
	CGRect imgRect = CGRectMake(0, 0, width, height);
	CGAffineTransform transform = CGAffineTransformMakeRotation(angleInRadians);
	CGRect rotatedRect = CGRectApplyAffineTransform(imgRect, transform);
	

paolonl

/*
  Define the proper methods based on the 
  desired kind of subscripting, indexed
  or keyed
*/

@interface IndexedSubscriptable
- (id)objectAtIndexedSubscript:(NSUInteger)idx
- (void)setObject:(id)anObject atIndexedSubscript:(NSUInteger)index
@end

paolonl

/*
 Source: WWDC2012 Modern Objective-C talk
 How to get a constant literal container to work.
*/

@implementation MyClass

static NSArray *thePlanets;

+ (void)initialize {

paolonl

/*
 Enum with Fixed Underlying Type
 New with Xcode 4.4
 Via WWDC2012 Session 405 - Modern Objective-C

 Results in better code completion and stronger type checking.
 Use -Wconversion compiler flag to check for enum type errors.
 -Wswitch for checking if switch statement is fully handled for enum.
*/