iOS开发中简单实用的几个小技巧

button.transform = CGAffineTransformMakeScale(-1.0, 1.0);button.titleLabel.transform = CGAffineTransformMakeScale(-1.0, 1.0);button.imageView.transform = CGAffineTransformMakeScale(-1.0, 1.0);

[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];self.navigationController.navigationBar.translucent = YES;

self.navigationController.navigationBar.shadowImage = [UIImage new];

self.navigationController.hidesBarsOnSwipe = Yes;

 //时间戳 time_t now; time(&now); NSLog(@"---%ld",now);

 UIView *blueView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 100)]; blueView.backgroundColor = [UIColor blueColor]; [self.view addSubview: blueView];  /*设置圆角位置的枚举参数  UIRectCornerTopLeft  = 1 << 0,  UIRectCornerTopRight = 1 << 1,  UIRectCornerBottomLeft = 1 << 2,  UIRectCornerBottomRight = 1 << 3,  UIRectCornerAllCorners = ~0UL  */ UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:blueView.bounds byRoundingCorners:(UIRectCornerTopLeft|UIRectCornerTopRight) cornerRadii:CGSizeMake(20.0, 20.0)]; CAShapeLayer *maskLayer = [CAShapeLayer layer]; maskLayer.frame = blueView.bounds; maskLayer.path = maskPath.CGPath; blueView.layer.mask = maskLayer;

// 控制器实现此方法- (BOOL)canPerformAction:(SEL)action withSender:(id)sender{ if (action == @selector(copy:) ||  action == @selector(paste:)||  action == @selector(cut:)) {  return NO; } return [super canPerformAction:action withSender:sender];}

// 创建一个Nav基类 重写pushViewController:方法 如下：-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated { viewController.hidesBottomBarWhenPushed = YES; [super pushViewController:viewController animated:animated];}