ios - 如何为所有 push segues 设置符号断点？

Question

我目前正在调试我的应用程序，并且在执行 segue 时遇到问题，但我终究无法弄清楚它是从哪里调用的。

我想知道是否可以添加一个断点，以便应用暂停并显示调用它的行？

我试图添加一个符号断点，但无法让它工作。

Answer 1

为 UIViewController 创建类别并将其添加到其中:

+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Class class = [self class];

        SEL originalSelector = @selector(prepareForSegue:sender:);
        SEL swizzledSelector = @selector(yd_prepareForSegue:sender:);

        Method originalMethod = class_getInstanceMethod(class, originalSelector);
        Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);

        BOOL didAddMethod = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod));

        if (didAddMethod) {
            class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
        } else {
            method_exchangeImplementations(originalMethod, swizzledMethod);
        }
    });
}

- (void)yd_prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    [self yd_prepareForSegue:segue sender:sender];
    NSLog(@"prepareForSegue From: %@", self);
}