1-->TableView不显示没内容的Cell怎么办?
很简单
self.tableView.tableFooterView = [[UIView alloc] init];
试过的都说好.
2-->自定义了leftBarbuttonItem左滑返回手势失效了怎么办?
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
initWithImage:img
style:UIBarButtonItemStylePlain
target:self
action:@selector(onBack:)];
self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;
3-->ScrollView莫名其妙不能在viewController划到顶怎么办?
self.automaticallyAdjustsScrollViewInsets = NO;
4-->键盘事件写的好烦躁,都想摔键盘了,怎么办?
1.买个结实的键盘.
2.使用IQKeyboardManager(github上可搜索),用完之后腰也不疼了,腿也不酸了.
5-->为什么我的app老是不流畅,到底哪里出了问题?
这个神器叫做:KMCGeigerCounter,快去github搬运吧.
6-->怎么在不新建一个Cell的情况下调整(隐藏)separaLine的位置?
_myTableView.separatorInset = UIEdgeInsetsMake(0, screenWidth, 0, 0);
(注意: titleLabel的位置也会跟着改变)
7-->怎么点击self.view就让键盘收起,需要添加一个tapGestures么 ? NO
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self.view endEditing:YES];
}
8-->怎么给每个ViewController设定默认的背景图片?
使用基类啊,少年。
9-->想在代码里改在xib里添加的layoutAttributes,但是怎么用代码找啊?
像拉button一样的拉你的约束.nslayoutattribute也是可以拉线的.
10-->怎么像safari一样滑动的时候隐藏navigationbar?
navigationController.hidesBarsOnSwipe = Yes
11-->导航条返回键带的title太讨厌了,怎么让它消失!
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
forBarMetrics:UIBarMetricsDefault];
12-->CoreData用起来好烦,语法又臭又长,怎么办?
MagicRecord
13-->CollectionView 怎么实现tableview那种悬停的header?
CSStickyHeaderFlowLayout
14-->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 > 0) {
direction = UIPanGestureRecognizerDirectionDown;
} else {
direction = UIPanGestureRecognizerDirectionUp;
}
}
else {
if (velocity.x > 0) {
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;
}
}
15-->拉伸图片的时候怎么才能让图片不变形?
1.UIImage *image = [[UIImage imageNamed:@"xxx"] stretchableImageWithLeftCapWidth:10 topCapHeight:10];
2.使用九切片技术
16-->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:
17-->怎么一句话添加上拉刷新?
使用MJRefresh 最新的已经支持gif 图和添加刷新图片了
18-->怎么把tableview里cell的小对勾的颜色改成别的颜色?
_mTableView.tintColor = [UIColor redColor];
19-->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];
}
20-->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;
21-->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];
}
22-->如何修改导航返回按钮的标题(默认是上一级导航的title) ?
// 推到下个页面之前 修改backItem标题为返回
UIBarButtonItem *backBtn = [[UIBarButtonItem alloc] init];
backBtn.title = @"返回";
self.navigationItem.backBarButtonItem = backBtn;
[self.navigationController pushViewController:zhtVC animated:YES];
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