Question

我有那个在Obj-C中工作的代码，但是无法在NSClassFromString函数中找到在swift中使用Obj-C的方法：

NSArray *viewControllers = [[self navigationController] viewControllers];
    BOOL viewExists = NO;
    id obj;
    for (int i = 0; i < [viewControllers count]; i ++)
    {
        obj = [viewControllers objectAtIndex:i];
        if ([obj isKindOfClass:NSClassFromString(@"myViewController")])
        {
            if ([[obj valueForKey:@"synchroRunning"] boolValue])
            {
                [self performSelectorOnMainThread:@selector(startSpinner) withObject:nil waitUntilDone:NO];
                [synchroBtn setHidden:YES];
            }
            else
            {
                [self synchroClick:nil];
            }
            viewExists = YES;
        }
    }

如果我想使用它：

如果让vcObj = obj为？ myViewController 通过导入#import＆＃34; myViewcontroller.h＆＃34;我有一条错误消息。在桥上课：

<unknown>:0: error: failed to emit precompiled header '/Users/OlostA/Library/Developer/Xcode/DerivedData/Formbox-fpnftywlyjuvvubjjzpknxxdyhul/Build/Intermediates.noindex/PrecompiledHeaders/Formbox-Bridging-Header-swift_7N984CYB20BK-clang_28VAG4OSP9DZS.pch' for bridging header '/Users/OlostA/Desktop/Git/FormBox/formbox/Formbox/Planning/Formbox-Bridging-Header.h'

提前致谢。

Answer 1

假设此控制器中存在self.navigationController，这是您快速版本的代码：

    let viewControllers = self.navigationController!.viewControllers
    var viewExists = false

    for obj in viewControllers {
        if let running = obj.value(forKey: "synchroRunning") as? Bool {
            self.performSelector(onMainThread: #selector(startSpinner), with: nil, waitUntilDone: false)
        } else {
            self.synchroClick(nil)
        }

        viewExists = true
    }

您不需要NSClassFromString来查明类型是否为ViewController，因此Swift中的类型数组保证为ViewController类型。如果你希望它是空的，请务必在循环之前检查viewControllers.count > 0。

iOS：在Swift类中，如何使用Obj-C类的NSClassFromString？

1 个答案: