Question

// When row is selected
- (void)pickerView:(UIPickerView *)pickerTimer didSelectRow:(NSInteger)row inComponent:(NSInteger)component {   
    int minutes;
    int seconds;

    if (component == 0) {
        if (row < 0){
            minutes = row;
        } else {
            minutes = 0;
        }
    }
    if (component == 1) {
        if (row < 0){
            seconds = row;
        } else {
            seconds = 0;
        }
    }
    NSLog([NSString stringWithFormat:@"%f %f %d", minutes, seconds, row]);
    if (minutes != 0 && seconds != 0){
        [buttonTimer setTitle:[NSString stringWithFormat:@"%@ minutes and %@ seconds", minutes, seconds] forState:UIControlStateNormal];
    // Yes, I am trying to set the label of a button.
    }
    if (minutes == 0 && seconds != 0){
        [buttonTimer setTitle:[NSString stringWithFormat:@"%@ seconds", seconds] forState:UIControlStateNormal];
    }
    if (minutes != 0 && seconds == 0){
        [buttonTimer setTitle:[NSString stringWithFormat:@"%@ minutes", minutes] forState:UIControlStateNormal];    
    }
    if (minutes == 0 && seconds == 0){
        [buttonTimerFarts setTitle:[NSString stringWithFormat:@"Set time before play starts..."] forState:UIControlStateNormal];
    }

}

控制台将显示诸如

之类的内容

0.000000 -1.993950 2751746

三个第一个if（分钟秒）语句，从不运行。

那么，你能看到什么问题吗？

Answer 1

在您的代码中，仅当row < 0，minutes或seconds设置为row时。但在您的示例中，row为正，因此minutes和seconds仍为0，前三个ifs永远不会为真。

我对Objective-C了解不多，但你打印的是一个％f的整数，这可能会让你胡说八道。

你能看到这段代码有什么问题吗？因为我不能，但它仍然不起作用

1 个答案: