knight2010

print("Awesome swift, https://dev.swift")

knight2010

func locationManagerDidUpdate(notification: NSNotification) {
        if let userInfo = notification.userInfo, locations = userInfo["locations"], newLocation = (locations as! NSArray).firstObject {
            print("newLocation : \(newLocation)")
        }
    }

knight2010

[[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationDidReceiveMemoryWarningNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification * __unused notification) {
            [_af_defaultImageCache removeAllObjects];
        }];

knight2010

//第一种方法
    NSDate *start = [NSDate date];
    //2.根据url地址下载图片数据到本地（二进制数据）
    NSData *data = [NSData dataWithContentsOfURL:url];

    NSDate *end = [NSDate date];
    NSLog(@"第二步操作花费的时间为%f",[end timeIntervalSinceDate:start]);

//第二种方法
    CFTimeInterval start = CFAbsoluteTimeGetCurrent();

knight2010

  view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[noWorkoutsView]|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: views))
   
        view.addConstraint(NSLayoutConstraint(item:noWorkoutsView,
            attribute: .Top,
            relatedBy: .Equal,
            toItem: view,
            attribute: .Top,
            multiplier: 1.0,
            constant: 0))