ijoshsmith

import Foundation

extension Array
{
    /** Randomizes the order of an array's elements. */
    mutating func shuffle()
    {
        for _ in 0..<10
        {
            sort { (_,_) in arc4random() < arc4random() }

ijoshsmith

__weak id weakSelf = self;
void (^aBlock)(void) = ^{
    <MyClass> *strongSelf = weakSelf;
    if (strongSelf)
    {
        // strongSelf->someIvar = 42;
        // [strongSelf someMethod];
    }
};

ijoshsmith

// This code assumes that ARC is enabled.

// Returns the size of this View in its NIB.
+ (CGSize)preferredSize
{
    static NSValue *sizeBox = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        // Assumption: The XIB file name matches this UIView subclass name.
        UINib *nib = [UINib nibWithNibName:NSStringFromClass(self) bundle:nil];