Question

我正在设置一个开关，所以如果开关打开，它会使一个完全不同的视图中的按钮转到与开关关闭时不同的视图。我已经完成了我的研究并找到- (IBAction)mathTaskSwitched:(id)sender { [[NSUserDefaults standardUserDefaults] setBool:switch.on forKey:@"switchState"]; //error 1但是我试图启用此解决方案时遇到3次解析错误。我的代码是：

设置View.m（切换位置）

BOOL on = [[NSUserDefaults standardUserDefaults] boolForKey:@"switchState"];

    if (on) {
        double delayInSeconds = seconds;
        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
        dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
            UIViewController *viewController4 =
            [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController4"];
            [self presentViewController:viewController4 animated:YES completion:nil];
    } else { //errors 2&3
        double delayInSeconds = seconds;
        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
        dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
            UIViewController *viewController3 =
            [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController3"];
            [self presentViewController:viewController3 animated:YES completion:nil];

    }

尝试访问交换机bool的代码

$allegato->delete("tutti")

1：预期表达

2：预期'）'

3：预期'}'

这是与此相关的所有代码，我没有编辑过任何内容。

日Thnx

Answer 1

我没有看到第一部分代码有任何明显错误，所以我无法帮助你处理预期的表达式错误，但是后两个错误是由于未能关闭块上的大括号而造成的传递给dispatch_after。

例如，第一部分应为：

if (on) {
    double delayInSeconds = seconds;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        UIViewController *viewController4 =
        [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController4"];
        [self presentViewController:viewController4 animated:YES completion:nil];
    }); // note the brace and closing paren
}

Answer 2

BOOL on = [[NSUserDefaults standardUserDefaults] boolForKey:@"switchState"];

    if (on) {
        double delayInSeconds = seconds;
        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
        dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
            UIViewController *viewController4 =
            [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController4"];
            [self presentViewController:viewController4 animated:YES completion:nil];
});// You didn't close your block
    } else { //errors 2&3
        double delayInSeconds = seconds;
        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
        dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
            UIViewController *viewController3 =
            [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController3"];
            [self presentViewController:viewController3 animated:YES completion:nil];
});// You didn't close your block

    }

这就是问题所在。现在在你的代码中复制并替换它，它将起作用。

3解析错误obj c

2 个答案: