小编Sus*_*rma的帖子

我正在使用导航应用程序.我将First ViewController推送到Second ViewController,从Second ViewController推送到Third ViewController.现在我想从Third ViewController弹出到First ViewController.我正在使用下面的代码执行此任务,但我的应用程序崩溃了.

请任何机构给我一些适当的指导.我不能使用pop到rootViewController,因为它是不同的viewController.提前致谢...

在第三个ViewControler中我写了这个:

FirstViewCtr *x=[[FirstViewCtr alloc] initWithNibName:@"FirstViewCtr" bundle:nil];
[self.navigationController popToViewController:x animated:NO];

在xcode 7.2中,对象列表中没有Storyboard Entry Point项.我需要使用Storyboard Entry Point,我在谷歌搜索中找不到任何类似的问题所以任何人都可以帮助我.

嗨,我是iOS的新手,我正在尝试使用JSON从Web服务获得响应,但发生以下错误.请帮我解决一下.

Error Domain = NSCocoaErrorDomain Code = 3840"操作无法完成.(Cocoa error 3840.)"(JSON文本没有以数组或对象开头,并且选项允许未设置片段.)UserInfo = 0x7fd30bee0f70 {NSDebugDescription = JSON text没有从数组或对象和选项开始,以允许未设置片段.,NSUnderlyingError = 0x7fd30bede7b0"请求失败:内部服务器错误(500)"}

-(void)loadFeedWithOffset:(NSInteger)Offset Limit:(NSInteger)Limit
{
     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

//      [manager.requestSerializer setValue:@"application/json;                 text/html" forHTTPHeaderField:@"Accept"];
//      [manager.requestSerializer setValue:@"application/json;     text/html; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];

    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    [params setValue:[[NSUserDefaults standardUserDefaults] objectForKey:@"UID"] forKey:@"user_id"];
    [params setValue:[NSString stringWithFormat:@"%ld",(long)Offset] forKey:@"offset"];
    [params setValue:[NSString stringWithFormat:@"%ld",(long)Limit] forKey:@"limit"];
    [params setValue:[NSString stringWithFormat:@"%d",[AppDelegate sharedAppDelegate].intPostType] forKey:@"post_type"];

    [manager POST:[NSString stringWithFormat:@"%@webservices/post/load", API_URL] parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject)
 {

     NSLog(@"JSON: %@", responseObject);
     if ([[responseObject objectForKey:@"status"] …

错误:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[__NSCFArray removeObjectAtIndex:]: mutating method sent to immutable object'

Run Code Online (Sandbox Code Playgroud)

代码:

.h

@property (nonatomic, strong) NSMutableArray *history;

.m

- (void)tableView:(UITableView *)tableView commitEditingStyle:           (UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
    {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        NSString *de = [[self.history objectAtIndex:indexPath.row] objectForKey:@"des"];
        NSString *dest = [de stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
        NSURL *jsonURL = [NSURL URLWithString:[NSString stringWithFormat:@"http://example.com/rm_history.php?user_id=%@&destinations=%@",self.uID,dest]];
    NSData *jsonData = [NSData dataWithContentsOfURL:jsonURL];
         [self.history removeObjectAtIndex:indexPath.row];
        [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil]
                   withRowAnimation:UITableViewRowAnimationFade];   
    }
    else if (editingStyle == UITableViewCellEditingStyleInsert) {   
        NSLog(@"create");
        // Create a new instance …

我正在使用 SDWebImage库来处理图像缓存。我实现了一种从服务器下载图像并在tableView. 这是我下载图像并在tableViewCell In中显示的代码cellForRowAtIndexPath，我执行了以下代码

[cell.profileImageView sd_setImageWithURL:[NSURL URLWithString:url] placeholderImage:nil options:SDWebImageRefreshCached];

它在这里完美地工作。但是当我更新服务器上的图像时，tableViewCell仍然显示相同的图像。问题是，它的缓存没有更新图像。我用相同的关键字进行搜索，并在 StackOverflow 上发现了这个问题。但无法解决问题。我还尝试清除内存和缓存viewDidDisappear

-(void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:YES];
    [[SDImageCache sharedImageCache]clearMemory];
    [[SDImageCache sharedImageCache]clearDisk];
}

但这不是有效的方法。当服务器上的图像更新时，是否有其他方法来更新缓存？

我有这个枚举:

enum DealStatus:String {
    case PENDING = "Pending"
    case ACTIVE = "Active"
    case STOP = "Stop"
    case DECLINED = "Declined"
    case PAUSED = "Paused"
}

和结构:

struct ActiveDeals: Decodable {
    let keyword:            String
    let bookingType:        String
    let expiryDate:         Int
    let createdAt:          Int?
    let shopLocation:       String?
    let dealImages:         [DealImages]?
    let dealStatus:         String?
    let startingDate:       Int?
}

在结构中我试图将枚举作为类型分配dealStatus如下:

struct ActiveDeals: Decodable {
        let keyword:            String
        let bookingType:        String
        let expiryDate:         Int
        let createdAt:          Int?
        let shopLocation:       String?
        let dealImages:         [DealImages]? …

因为我更新到angular7,我收到错误？

的package.json

"dependencies": {
            "@angular/animations": "^7.0.3",
            "@angular/common": "^7.0.3",
            "@angular/compiler": "^7.0.3",
            "@angular/core": "^7.0.3",
            "@angular/forms": "^7.0.3",
            "@angular/http": "^7.0.3",
            "@angular/platform-browser": "^7.0.3",
            "@angular/platform-browser-dynamic": "^7.0.3",
            "@angular/platform-server": "^7.0.3",
            "@angular/router": "^7.0.3",
            "@ng-bootstrap/ng-bootstrap": "^1.0.0-beta.9",
            "@types/lodash": "^4.14.116",
            "bootstrap": "^4.1.3",
            "core-js": "^2.5.7",
            "font-awesome": "^4.7.0",
            "hammerjs": "^2.0.8",
            "ng-connection-service": "^1.0.4",
            "ngx-perfect-scrollbar": "^6.3.1",
            "ngx-toastr": "^9.1.0",
            "ngx-ui-switch": "^1.6.0",
            "rxjs": "^6.3.3",
            "rxjs-compat": "^6.3.3",
            "web-animations-js": "2.3.1",
            "zone.js": "^0.8.26"
        },
        "devDependencies": {
            "@angular-devkit/build-angular": "^0.10.5",
            "@angular/cdk": "^6.4.7",
            "@angular/cli": "^7.0.5",
            "@angular/compiler-cli": "^7.0.3",
            "@angular/language-service": "^7.0.3",
            "@angular/material": "^6.4.7",
            "@types/jasmine": "^2.8.11",
            "@types/jasminewd2": "~2.0.2",
            "@types/node": "^10.12.6",
            "codelyzer": "^4.5.0",
            "jasmine-core": "^3.3.0",
            "jasmine-spec-reporter": "^4.2.1",
            "karma": …

我有一个UILabel子视图,UIButton我从另一个视图传递值并填充UILabel.现在,我希望UILabel 必须根据内容更改其高度.如果文本为"Hello",则必须为1行,但如果文本为"我的文本太长而无法放入标签",则必须更改其大小.我用过

   [self.addressLabel sizeToFit];

但为此,我需要在UILabel下留下空白空间.我想要的是,当文本强度增加时,UILabel和UIView的大小必须扩展.

在我的react-native项目中，我有“boost-for-react-native”的依赖并像这样安装它：

  pod 'boost-for-react-native', :podspec => 'https://raw.githubusercontent.com/react-native-community/boost-for-react-native/master/boost-for-react-native.podspec'

最近工作得很好。我不确定发生了什么变化，但我现在无法安装 Pod。当我运行 pod install 时出现此错误

[!] CocoaPods could not find compatible versions for pod "boost-for-react-native":
  In Podfile:
    Folly (from `../node_modules/react-native/third-party-podspecs/Folly.podspec`) was resolved to 2018.10.22.00, which depends on
      boost-for-react-native

    React-jsi (from `../node_modules/react-native/ReactCommon/jsi`) was resolved to 0.61.5, which depends on
      boost-for-react-native (= 1.63.0)

    boost-for-react-native (from `https://raw.githubusercontent.com/react-native-community/boost-for-react-native/master/boost-for-react-native.podspec`)

我尝试过删除node_modules、删除podfile.lock、分解pod。我还尝试将 podfile 和应用程序目标中的部署版本升级到 11.0。但我仍然收到上述错误。

我将非常感谢对此的任何帮助。谢谢

UITextField *textField;
NSInteger intRollNumber;

我想从中获取rollNumber输入textField并将值存储到intRollNumber.

我是怎么做到的？因为我无法将字符串转换为整数.

我有UITableView1个部分和numberOfRows:来自NSMutableArray.

我想要的是每当UITableView出现滚动视图时必须滚动到最后一行.

为此我想要indexPath最后一行.怎么弄？

我知道这个问题已被多次回答.但这些方法都不适合我.

这是我试过的代码

-(NSIndexPath*)lastIndexPath{
     NSInteger sectionsAmount = [myTableView numberOfSections];
     NSInteger rowsAmount = [myTableView numberOfRowsInSection:sectionsAmount-1];
     NSIndexPath *lastIndexPath = [NSIndexPath indexPathForRow:(rowsAmount - 1) inSection:(sectionsAmount - 1)];
     return lastIndexPath;
 }