iOS开发的一些奇巧淫技
iOS开发的一些奇巧淫技
http://www.cocoachina.com/ios/20141229/10783.html
TableView不显示没内容的Cell怎么办?
类似这种,我不想让下面那些空的显示.
01.png
很简单.
self.tableView.tableFooterView=[[UIViewalloc]init];
试过的都说好.
加完这句之后就变成了这样.
02.png
自定义了leftBarbuttonItem左滑返回手势失效了怎么办?
self.navigationItem.leftBarButtonItem=[[UIBarButtonItemalloc]
initWithImage:img
style:UIBarButtonItemStylePlain
target:self
action:@selector(onBack:)];
self.navigationController.interactivePopGestureRecognizer.delegate=(id)self;
ScrollView莫名其妙不能在viewController划到顶怎么办?
self.automaticallyAdjustsScrollViewInsets=NO;
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.
为什么我的app老是不流畅,到底哪里出了问题?
如图
03.gif
这个神器叫做:KMCGeigerCounter,快去github搬运吧.
怎么在不新建一个Cell的情况下调整separaLine的位置?
_myTableView.separatorInset=UIEdgeInsetsMake(0,100,0,0);
怎么点击self.view就让键盘收起,需要添加一个tapGestures么?
-(void)touchesBegan:(NSSet*)toucheswithEvent:(UIEvent*)event
{
[self.viewendEditing:YES];
}
怎么给每个ViewController设定默认的背景图片?
使用基类啊,少年。
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.
怎么像safari一样滑动的时候隐藏navigationbar?
navigationController.hidesBarsOnSwipe=Yes
导航条返回键带的title太讨厌了,怎么让它消失!
[[UIBarButtonItemappearance]setBackButtonTitlePositionAdjustment:UIOffsetMake(0,-60)
forBarMetrics:UIBarMetricsDefault];
CoreData用起来好烦,语法又臭又长,怎么办?
MagicRecord
CollectionView怎么实现tableview那种悬停的header?
CSStickyHeaderFlowLayou
能不能只用一个pan手势来代替UISwipegesture的各个方向?
-(void)pan:(UIPanGestureRecognizer*)sender
{
typedefNS_ENUM(NSUInteger,UIPanGestureRecognizerDirection){
UIPanGestureRecognizerDirectionUndefined,
UIPanGestureRecognizerDirectionUp,
UIPanGestureRecognizerDirectionDown,
UIPanGestureRecognizerDirectionLeft,
UIPanGestureRecognizerDirectionRight
};
staticUIPanGestureRecognizerDirectiondirection=UIPanGestureRecognizerDirectionUndefined;
switch(sender.state){
caseUIGestureRecognizerStateBegan:{
if(direction==UIPanGestureRecognizerDirectionUndefined){
CGPointvelocity=[sendervelocityInView:recognizer.view];
BOOLisVerticalGesture=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;
}
caseUIGestureRecognizerStateChanged:{
switch(direction){
caseUIPanGestureRecognizerDirectionUp:{
[selfhandleUpwardsGesture:sender];
break;
}
caseUIPanGestureRecognizerDirectionDown:{
[selfhandleDownwardsGesture:sender];
break;
}
caseUIPanGestureRecognizerDirectionLeft:{
[selfhandleLeftGesture:sender];
break;
}
caseUIPanGestureRecognizerDirectionRight:{
[selfhandleRightGesture:sender];
break;
}
default:{
break;
}
}
break;
}
caseUIGestureRecognizerStateEnded:{
direction=UIPanGestureRecognizerDirectionUndefined;
break;
}
default:
break;
}
}
拉伸图片的时候怎么才能让图片不变形？
1.UIImage*image=[[UIImageimageNamed:@"xxx"]stretchableImageWithLeftCapWidth:10topCapHeight:10];
2.
05.gif
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
[tableViewaddPullToRefreshWithActionHandler:^{
//prependdatatodataSource,insertcellsattopoftableview
//call[tableView.pullToRefreshViewstopAnimating]whendone
}position:SVPullToRefreshPositionBottom];
怎么把tableview里cell的小对勾的颜色改成别的颜色？
_mTableView.tintColor=[UIColorredColor];
04.png
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*)navigationControllerwillShowViewController:(UIViewController*)viewControlleranimated:(BOOL)animated
{
[[UIApplicationsharedApplication]setStatusBarStyle:UIStatusBarStyleLightContent];
}
怎么把我的navigationbar弄成透明的而不是带模糊的效果？
[self.navigationBarsetBackgroundImage:[UIImagenew]
forBarMetrics:UIBarMetricsDefault];
self.navigationBar.shadowImage=[UIImagenew];
self.navigationBar.translucent=YES;
怎么改变uitextfieldplaceholder的颜色和位置？
继承uitextfield，重写这个方法
-(void)drawPlaceholderInRect:(CGRect)rect{
[[UIColorblueColor]setFill];
[self.placeholderdrawInRect:rectwithFont:self.fontlineBreakMode:UILineBreakModeTailTruncationalignment:self.textAlignment];
}
你为什么知道这么多奇怪的花招？
去stackoverflow刷问题啊，少年！