本篇文章为大家展示了如何在iOS中封装UIPickerView,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
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, 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。
上述内容就是如何在iOS中封装UIPickerView,你们学到知识或技能了吗?如果还想学到更多技能或者丰富自己的知识储备,欢迎关注亿速云行业资讯频道。
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