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- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
    if (scrollView.contentOffset.x < -scrollView.contentInset.left) {
        targetContentOffset->x = -scrollView.contentInset.left;
    } else {
        *targetContentOffset = CGPointZero;
    }
}

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- (void)layoutSubviews {
    [super layoutSubviews];
    // This is necessary to ensure that the content size scales with the view.
    self.scrollView.contentSize = self.contentView.bounds.size;
    self.scrollView.contentOffset = CGPointZero;
}

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2015-01-26 22:19:55.120 SwipeableTableViewCell[21735:2347995] setFrame
frame={{0, 0}, {320, 44}}
self.bounds={{0, 0}, {320, 44}}
self.frame={{0, 0}, {320, 44}}
self.contentView.bounds={{0, 0}, {0, 0}}
self.scrollView.bounds={{0, 0}, {0, 0}}
self.scrollView.frame={{0, 0}, {0, 0}}
self.scrollView.contentOffset={0, 0}

2015-01-26 22:19:55.121 SwipeableTableViewCell[21735:2347995] setFrame

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- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if (scrollView.contentOffset.x > 0) {
        scrollView.contentOffset = CGPointZero;
    }
}

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- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if (scrollView.contentOffset.x > 0) {
        scrollView.contentOffset = CGPointZero;
    }

    self.buttonsView.frame = CGRectMake(scrollView.contentOffset.x, 0, 160, self.buttonsView.frame.size.height);
}

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@interface AlertViewCallback : NSObject <UIAlertViewDelegate>
@property (copy, nonatomic) void (^callback)(void);
@end

@implementation AlertViewCallback

+ (instancetype)callback:(void (^)(void))callback {
    return [[self alloc] initWithCallback:callback];
}

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- (void)alertWithTitle:(NSString *)title
               message:(NSString *)message
                 close:(NSString *)closeText
                action:(NSString *)actionText
                  then:(void (^)(void))block
{
    if ([UIAlertController class]) {
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:title
                                                                       message:message
                                                                preferredStyle:UIAlertControllerStyleAlert];

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// Observed bug(?): When adding a button after creating UIAlertView, the firstOtherButtonIndex value
// is stuck as -1 instead of the correct value, 1, even though the documentation states that the two
// invocations below should be equivalent.

NSString *closeText = @"Cancel";
NSString *actionText = @"OK";

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title
                                                    message:message
                                                   delegate:self

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- (BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)recognizer {
    if (recognizer != self.panGestureRecognizer) {
        if ([super respondsToSelector:@selector(gestureRecognizerShouldBegin:)]) {
            return [super gestureRecognizerShouldBegin:recognizer];
        } else {
            return YES;
        }
    }

    CGPoint translation = [recognizer translationInView:self];

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// Playground: http://play.golang.org/p/G9-_EtwPRg
package main

import (
	"fmt"
	"math/rand"
	"time"
)

type WorkerId int