r3econ

@interface UIColor (Random)

+ (UIColor *)randomColor;
 
@end

r3econ

@interface UIFont (FamilyNames)

+ (void)logFontNames;

@end

r3econ

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^
                        {
                            // Background thread stuff.
    
                            dispatch_async(dispatch_get_main_queue(), ^
                                           {
                                             // Main thread stuff.
                                           });
                        });

r3econ

CGFloat DegreesToRadians(CGFloat degrees)
{
    return degrees * M_PI / 180;
};

CGFloat RadiansToDegrees(CGFloat radians)
{
    return radians * 180 / M_PI;
};

r3econ

#import <Foundation/Foundation.h>

@interface NSString (RAFExtensions)

/**
 Returns random alphanumeric string with a given length.
*/
+ (NSString *)randomStringWithLength:(NSUInteger)length;

/**

r3econ

Block Declaration Syntax

• return_type be the type of object/primitive/etc. you'd like to return (commonly void)
• blockName be the variable name of the block you're creating
• var_type be the type object/primitive/etc. you'd like to pass as an argument (leave blank for no parameters)
• varName be the variable name of the given parameter And remember that you can create as many parameters as you'd like.

Blocks as Variables

Possibly the most common for of declaration.

r3econ

@interface UIColor (Extensions)


/**
 Returns a UIColor for a color given in a hexadecimal string format.
 Such as #00FF00.
 */
+ (UIColor *)colorWithHexString:(NSString *)hexString;

r3econ

CGFloat DistanceBetweenTwoPoints(CGPoint pointA, CGPoint pointB)
{
    CGFloat dx = pointB.x - pointA.x;
    CGFloat dy = pointB.y - pointA.y;
    
    return sqrt(dx*dx + dy*dy);
};

r3econ

#import <Foundation/Foundation.h>

@interface NSObject (Extensions)

- (void)performBlock:(void (^)(void))block 
          afterDelay:(NSTimeInterval)delay; 

@end