1.滑动UIScrollView时不影响定时器NSTimer
[[NSRunLoop mainRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
2.导航控制器透明效果
self.navigationController.navigationBar.translucent = YES;
UIColor * color = [UIColor clearColor];
CGRect rect = self.navigationController.navigationBar.frame;
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[self.navigationController.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.clipsToBounds = YES;
3.UIPickerView的高度设置
UIPickerView的高度只有三个：162、180、116
4.更新pod的本地库
pod repo update
5.检查podspec文件是否正确
pod spec lint
6.UIScroll 中上下左右拉伸弹簧效果设置
@property（nonatomic）BOOL alwaysBounceVertical
@property (nonatomic) BOOL alwaysBounceHorizontal
7.修改UITextField中的输入视图
修改 inputAccessoryView 变量
