UIPickerView的简单封装

在iOS实际项目中，经常会出现界面中多个地方需要使用UIPickerView,如果在每个需要用到的地方都创建一个UIPickerView不仅更耗性能，而且还会让你的代码变得更加杂乱、冗余，因此我在这里向大家介绍一下我对UIPickerView的一些简单封装。

所需属性

/** pickerView*/

@property (nonatomic, strong) NSMutableArray *mulDataArray;

如果只需要一列的话，只需要传入一个数据数组:slDataArray,如果需要两行，则两个数组都需要赋值。

实现UIPickerView代理方法

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{       if (self.mulDataArray.count == 0) {          return 1;      }else {          return 2;          }  }  -(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{      if (component == 0) {          return self.slDataArray.count;          }else {          return self.mulDataArray.count;      }  }  -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent: (NSInteger)component{      if (component == 0) {          return self.slDataArray[row];      }else {      return self.mulDataArray[row];      }  } 

这里根据两个数组来初始化pickerView的内容，即判断第二个数组(mulDataArray)是否有数据，有数据的话代表加载两列的pickerView，否则加载一列。

功能实现

-(void)pickerViewSelectRow:(NSInteger)row {      self.selectRow = row;      [self.pickerView selectRow:row inComponent:0 animated:NO];  }  -(void)pickerViewSelectRow:(NSInteger)row lastRow:(NSInteger)lastRow{      [self.pickerView selectRow:row inComponent:0 animated:NO];      [self.pickerView selectRow:lastRow inComponent:1 animated:NO];  }

第一个方法是只有一列的pickerView初始化是让其选中哪行，第二个则是两列的选择方法。

-(void)showOrHidePickerView:(BOOL)isShow{      if (isShow) {          if (self.isPickerShow == NO) {              [self addSubview:self.backGroundView];              [self addSubview:self.pickerBackGroundView];              [UIView animateWithDuration:0.3 animations:^{                   self.backGroundView.alpha = 0.5;                   self.pickerBackGroundView.frame = CGRectMake(0, SCREEN_HEIGHT -220, SCREEN_WIDTH, 220);              } completion:^(BOOL finished) {            self.isPickerShow = YES;              }];          }      }else {          if (self.isPickerShow) {              [UIView animateWithDuration:0.3 animations:^{              self.backGroundView.alpha = 0.0;              self.pickerBackGroundView.frame = CGRectMake(0, SCREEN_HEIGHT, SCREEN_WIDTH, 220);          } completion:^(BOOL finished) {              [self.backGroundView removeFromSuperview];              [self.pickerBackGroundView removeFromSuperview];              self.isPickerShow = NO;          }];          }      }  } 

这个方法是显示或者隐藏pickerView,通过动画的方式，背景慢慢变黑或者透明，pickerView从下往上出现或者从上往下消失。

-(void)pickerViewReloadData{      [self.pickerView reloadAllComponents];  } 

刷新pickerView数据，加载另一个pickerView时，调用该方法刷新。