前言
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) UIPickerView pickerView; /* pickerView背景*/ @property (nonatomic,strong) UIView pickerBackGroundView; /* 背景*/ @property (nonatomic,strong) UIView backGroundView; /* 确认按钮*/ @property (nonatomic,strong) UIButton sureButton; /* 取消按钮*/ @property (nonatomic,strong) UIButton cancelButton; /* 单列pickerView*/ @property (nonatomic,strong) NSMutableArray slDataArray; /* 双列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,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。
总结