objective-c - 您能在这段代码中看到什么错误吗？ 'Cause I can’ t，但仍然无法正常工作

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
0.000000 -1.993950 2751746
前三个if(分钟秒)语句永远不会运行。

那么，您能看到任何错误吗？

Answer 1

在您的代码中，仅将row < 0，minutes或seconds设置为row。但是在您的示例中，row为正，因此minutes和seconds仍然都是0，并且前三个if永远都不为真。

而且我对Objective-C不太了解，但是您正在用％f打印一个整数，这可能会给您带来胡扯。