iOS开发的一些奇巧淫技2
2024-09-12 16:36:12
能不能只用一个pan手势来代替UISwipegesture的各个方向?
- (void)pan:(UIPanGestureRecognizer *)sender
{ typedef NS_ENUM(NSUInteger, UIPanGestureRecognizerDirection) {
UIPanGestureRecognizerDirectionUndefined,
UIPanGestureRecognizerDirectionUp,
UIPanGestureRecognizerDirectionDown,
UIPanGestureRecognizerDirectionLeft,
UIPanGestureRecognizerDirectionRight
}; static UIPanGestureRecognizerDirection direction = UIPanGestureRecognizerDirectionUndefined; switch (sender.state) { case UIGestureRecognizerStateBegan: { if (direction == UIPanGestureRecognizerDirectionUndefined) { CGPoint velocity = [sender velocityInView:recognizer.view]; BOOL isVerticalGesture = fabs(velocity.y) > fabs(velocity.x); if (isVerticalGesture) {
if (velocity.y > ) {
direction = UIPanGestureRecognizerDirectionDown;
} else {
direction = UIPanGestureRecognizerDirectionUp;
}
} else {
if (velocity.x > ) {
direction = UIPanGestureRecognizerDirectionRight;
} else {
direction = UIPanGestureRecognizerDirectionLeft;
}
}
} break;
} case UIGestureRecognizerStateChanged: {
switch (direction) {
case UIPanGestureRecognizerDirectionUp: {
[self handleUpwardsGesture:sender];
break;
}
case UIPanGestureRecognizerDirectionDown: {
[self handleDownwardsGesture:sender];
break;
}
case UIPanGestureRecognizerDirectionLeft: {
[self handleLeftGesture:sender];
break;
}
case UIPanGestureRecognizerDirectionRight: {
[self handleRightGesture:sender];
break;
}
default: {
break;
}
}
break;
} case UIGestureRecognizerStateEnded: {
direction = UIPanGestureRecognizerDirectionUndefined;
break;
} default:
break;
} }
拉伸图片的时候怎么才能让图片不变形？
UIImage *image = [[UIImage imageNamed:@"xxx"] stretchableImageWithLeftCapWidth: topCapHeight:];
(刚才有人提醒这个已经deprecated了哈,现在的方法叫resizableImageWithCapInsets).
怎么播放GIF的时候这么卡，有没有好点的库？
FlipBoard出品的太适合你了。https://github.com/Flipboard/FLAnimatedImage
怎么一句话添加上拉刷新？
https://github.com/samvermette/SVPullToRefresh
[tableView addPullToRefreshWithActionHandler:^{
// prepend data to dataSource, insert cells at top of table view
// call [tableView.pullToRefreshView stopAnimating] when done
} position:SVPullToRefreshPositionBottom];
怎么把tableview里cell的小对勾的颜色改成别的颜色？
_mTableView.tintColor = [UIColor redColor];
本来我的statusbar是lightcontent的，结果用UIImagePickerController会导致我的statusbar的样式变成黑色，怎么办？
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated { [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent]; }
怎么把我的navigationbar弄成透明的而不是带模糊的效果？
[self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault]; self.navigationBar.shadowImage = [UIImage new]; self.navigationBar.translucent = YES;
怎么改变uitextfield placeholder的颜色和位置？
继承uitextfield，重写这个方法
- (void) drawPlaceholderInRect:(CGRect)rect { [[UIColor blueColor] setFill]; [self.placeholder drawInRect:rect withFont:self.font lineBreakMode:UILineBreakModeTailTruncation alignment:self.textAlignment]; }
你为什么知道这么多奇怪的花招？
去stackoverflow刷问题啊，少年！
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