I have tried the CoreData modification operation in Demo as follows: 1, first create a new basic table and add fields, then add some data in app 2, exit app, new table, add new fields, add Relationships 3, and there is no flicker after rerunning the ...

request that many news interfaces are used. After the drop-down refresh, a prompt box comes out and studies how this is not found. Does anyone know? is the yellow box that has updated 8 pieces of information for you ...

1. The project is an old OC project. In the bridge swift 2.build Setting configuration, Defines Module is changed to yes,product Name as the project name, the bridge file is automatically generated by the system and the path is correct 3. Create an ex...

the size parameter of the UIGraphicsBeginImageContextWithOptions function is too large, resulting in a memory explosion I use size data, which is about 3 times the height and width of the screen size, that is (3 UIScreen.main.bounds.height,3 UIScree...

IOS ele.me product details page ~ how to achieve this effect? Can you explain? thank you. TableView can t move when it slides up ~ TableView can slide only when it reaches the top....

as detailed in the title: in my impression, iOS loads h5 content and loads an h5 page directly, and the final result is that the content displayed on a page is displayed directly on the h5 page, so why do you still need to get the height of h5 content?...

want to achieve an effect, such as album APP, select photos, long press to select multiple photos, when the gesture slides to the bottom of the screen, the view will automatically scroll up to allow users to select more pictures, how should this functio...

WKWebView failed to load picture [loadHTMLString:content baseURL:nil], when using this code to load dddddd ...

problem description do you need to judge the system version number when introducing the header file library? our app supports iOS8.0 at a minimum. I now need to use a library that is only available in iOS9.0. In this case, do you need to judge the sy...

Special characters are restricted 24 CAN ...

A private method is used to get the corresponding accessorBar, and then hide it var = accessory=subviewOfInputSetHostView.performSelector(Selector("placeheldView")).takeRetainedValue() How to write this sentence in OC? Ask the great god f...

< H1 > define cellWithClassIdentifier (Class,identifier) < H1 > + (instancetype) cellWithTableView: (UITableView ) tableView identifier: (NSString ) identifier { Class * cell = [tableView dequeueReusableCellWithIdentifier:identifier]; if (! ce...

problem description when you do IM live chat, when you receive a message, you will display a small red corner sign on the icon of App, and there are several unread messages. Then the chat list shows the number of unread messages for a specific person,...

create a public library, but keep reporting errors. Address: https: github.com shang12191. ...

problem description because our company s App wants to be an overseas market, it starts with internationalizing the language, setting the English or Chinese mode according to the user s choice. However, overseas and domestic requirements are differe...

NSDateComponents *components = [NSCalendar.currentCalendar components:NSUIntegerMax fromDate:self]; what is the reasonableness of components:NSUIntegerMax s writing like this? ...

what is the idea of ios similar to map sdk to read picture resources from the basic resource database? ...

iOS uses pod to search and install DifferenceKit prompts that the installation failed and could not be found. Is there any way to solve it? Or the problem of uploading by the author himself. All other pod libraries are normal: Unable to find a pod wit...

UITapGestureRecognizer *tap =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDeteted:)]; tapaction...

now, after 19 years, Xiaobai has come to find out what architecture framework iOS Android has for new projects, considering decoupling and expansibility. He has modestly learned a lot of advice ...