Question

我正在处理用户点击文本字段时显示的选择器视图。有多个文本字段和选择器视图我能够完成numberOfRowsInComponent但不能完成numberOfRowsInSection。

这是代码：

-(NSInteger)pickerView:(UIPickerView *) pickerView    numberOfRowsInComponent:(NSInteger)component {

     NSUInteger count = 0;

     if (self.schoolPicker) {
         count = [self.infoLibrary.school count];
     }
     if (self.majorPicker) {
         count = [self.infoLibrary.major count];
     } 
     if (self.classPicker) {
         count = [self.infoLibrary.classPicker count];
     }
     if (self.nationalityPicker) {
         count = [self.infoLibrary.nationality count];
     }
     if (self.commuterPicker) {
         count = [self.infoLibrary.commuter count];
     }
     if (self.honorsPicker) {
         count = [self.infoLibrary.honors count];
     }
     if (self.varsityAthletePicker) {
         count = [self.infoLibrary.varsityAthlete count];
     }
     return count;
}

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {

    NSString *count = 0;

    if (self.schoolPicker) {
         count = [self.infoLibrary.school objectAtIndex:row];
    }
    if (self.majorPicker) {
         count = [self.infoLibrary.major objectAtIndex:row];
    }
     if (self.classPicker) {
         count = [self.infoLibrary.classPicker objectAtIndex:row];
    }
     if (self.nationalityPicker) {
        count = [self.infoLibrary.nationality objectAtIndex:row];
    }
    if (self.commuterPicker) {
        count = [self.infoLibrary.commuter objectAtIndex:row];
    }
    if (self.honorsPicker) {
        count = [self.infoLibrary.honors objectAtIndex:row];
    }
    if (self.varsityAthletePicker) {
        count = [self.infoLibrary.varsityAthlete objectAtIndex:row];
    }
    return count;
}

Answer 1

我对你的问题有点困惑，因为numberOfRowsInSection：是一个UITableViewDataSource的方法，而不是UIPickerViewDataSource。也就是说，您发布的代码存在一致的问题。在您的方法中，您似乎正在测试它所在的选择器视图，例如，检查：

if (self.schoolPicker) { }

...仅检查该选择器视图是否存在，而不是是否是为其调用该方法的视图。

您想要检查：

if (pickerView==self.schoolPicker) { }

选取器视图和文本字段numberOfRowsInSection

1 个答案: