Question

我想在我的iOS应用中，用户可以点击UIButton选择一些字段。

我希望用户在点击UIButton时选择字段，按钮图像应更改并打开我的MMPickerView，当用户再次点击时，UIButton应取消选中并显示上一张图片在UIButton中，此时不要打开MMPickerview。

这是我的代码：

 - (IBAction)showPickerViewButtonPressed:(id)sender {
      if( (_button.selected = !_button.selected))
      {
           UIImage *bimage=[UIImage imageNamed: @"play.jpg"];
           [_button setImage:bimage forState:UIControlStateNormal];
      } 
      else
      {
           [MMPickerView showPickerViewInView:self.view
                       withStrings:_stringsArray
                       withOptions:@{MMbackgroundColor: [UIColor blackColor],
                                     MMtextColor: [UIColor whiteColor],
                                     MMtoolbarColor: [UIColor blackColor],
                                     MMbuttonColor: [UIColor whiteColor],
                                     MMfont: [UIFont systemFontOfSize:18],
                                     MMvalueY: @3,
                                     MMselectedObject:_selectedString}
                        completion:^(NSString *selectedString) {

                            _label.text = selectedString;
                            _selectedString = selectedString;
             }];
         }
   }

Answer 1

UIImage *bimage=[UIImage imageNamed: @"play_select.jpg"]; [_button setImage:bimage forState:UIControlStateSelected]; [_button setImage:bimage forState:UIControlStateHighlighted];

声明按钮

Answer 2

我猜你没有改变按钮的状态。试试这个......

- (IBAction)showPickerViewButtonPressed:(id)sender 
{
   if ([_button isSelected])
   {
      _button.selected=NO;
   } 
   else
   {
      _button.selected=YES; // change button's state
           [MMPickerView showPickerViewInView:self.view
                   withStrings:_stringsArray
                   withOptions:@{MMbackgroundColor: [UIColor blackColor],
                                 MMtextColor: [UIColor whiteColor],
                                 MMtoolbarColor: [UIColor blackColor],
                                 MMbuttonColor: [UIColor whiteColor],
                                 MMfont: [UIFont systemFontOfSize:18],
                                 MMvalueY: @3,
                                 MMselectedObject:_selectedString}
                    completion:^(NSString *selectedString) {

                        _label.text = selectedString;
                        _selectedString = selectedString;
                     //    _button.selected=YES;  change button's state here If you want to change state after completion.
                    }];
   }
}

并在您声明按钮的位置编写此代码。

  UIImage *bSelectedimage=[UIImage imageNamed: @"your image name for selected state"]; 
  UIImage *bimage=[UIImage imageNamed: @"your image name for default state"]; 
 [_button setImage:bSelectedimage forState:UIControlStateSelected];
 [_button setImage:bimage forState:UIControlStateNormal];

Answer 3

要将图像设置为按钮，请使用setbackground图像而不是setimage

[<buttoninstane> setBackgroundImage:<#(UIImage *)#> forState:UIControlStateNormal];
[<buttoninstane> setBackgroundImage:<#(UIImage *)#> forState:UIControlStateSelected];

将上面的代码写在声明按钮的位置

在按钮操作中使用以下编辑的代码

    - (IBAction)showPickerViewButtonPressed:(id)sender {
        if(_button.selected ){
[_button setSelected:NO];
          }
      else{
[_button setSelected:YES];
           [MMPickerView showPickerViewInView:self.view
                   withStrings:_stringsArray
                   withOptions:@{MMbackgroundColor: [UIColor blackColor],
                                 MMtextColor: [UIColor whiteColor],
                                 MMtoolbarColor: [UIColor blackColor],
                                 MMbuttonColor: [UIColor whiteColor],
                                 MMfont: [UIFont systemFontOfSize:18],
                                 MMvalueY: @3,
                                 MMselectedObject:_selectedString}
                    completion:^(NSString *selectedString) {

                        _label.text = selectedString;
                        _selectedString = selectedString;
                    }];
                }
             }

Answer 4

使用不同的按钮状态设置不同的图像 - (void)setImage:(UIImage *)image forState:(UIControlState)state;

在您的代码中，if语句(_button.selected = !_button.selected)将始终为true，因此else部分将永远不会运行。

Answer 5

Swift 4

在声明按钮的地方添加

android:layout_weight

在选择或取消选择时更改UIButton的图像

5 个答案: