所以我的视图中有这个滑动器, 它最多有13分和1分。 取决于您如何移动滑动滑动器, 数字的变化, 并且可以显示在标签上, 标签上显示滑动器正在打开的当前数字 。
我希望能够将滑动器的内注从滑动器转换为字符串; 所以如果滑动器的进展是 13, 我希望标签能读“ A+”, 12 加上“ A” 11 加上“ A - ” 等。
不必做13个“ 如果” 语句, 因为我有不止一个滑动符, 是否有方法来检查滑动符的进度, 然后将数字转换为所需的字母等级?
这是我的一个滑动符的代码
-(IBAction)sliderChanged:(id)sender{
UISlider *slider = (UISlider *)sender;
int progress = (int)roundf(slider.value);
c1Grade.text = [NSString stringWithFormat:@"%d",progress];
}
// c1Grade is the label next to the slider showing the progress
绘制字符串阵列, 并在索引中显示描述 : A" 在索引12, 等等。
NSArray *gradeDescriptions = [NSArray arrayWithObjects: @"", @"F", @"D-", @"D", @"D+", @"C-", @"C", @"C+", @"B-", @"B", @"B+", @"A-", @"A", @"A+", nil];
NSString *descr = [gradeDescriptions objectAt:sliderPosition];
由于 descriptions 数组从不更改, 您可以先初始化一次, 并存储在一个静态变量或 ivar 中 。
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