错误：无法解决：support-core-ui

Question

1）不起作用：

首先点击“同步” gradle

然后清理并重建应用程序

并使无效并重新启动

2）有：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.window.backgroundColor = [UIColor whiteColor];
    ViewController *mainViewController = [[ViewController alloc] init];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:mainViewController];
    self.window.rootViewController = mainViewController;
    [self.window makeKeyAndVisible];

    return YES;
}

3）尝试实施库：

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
}

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    NSLog(@"viewWillAppear");
}

@end

此外，有时我会收到此错误：

  

找不到support-core-ui.jar   （com.android.support:support-core-ui:27.1.1）。       在以下位置搜索：           https://jcenter.bintray.com/com/android/support/support-core-ui/27.1.1/support-core-ui-27.1.1.jar

allprojects {
    repositories {
        jcenter()
        maven { url "https://jitpack.io" }
        mavenLocal()
        google()
    }
}