iOS UIPickerView的简单封装示例

前言

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, span) UIPickerView pickerView;

/* pickerView背景*/

@property (nonatomic, span) UIView pickerBackGroundView;

/* 背景*/

@property (nonatomic, span) UIView backGroundView;

/* 确认按钮*/

@property (nonatomic, span) UIButton sureButton;

/* 取消按钮*/

@property (nonatomic, span) UIButton cancelButton;

/* 单列pickerView*/

@property (nonatomic, span) NSMutableArray slDataArray;

/* 双列pickerView*/

@property (nonatomic, span) 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。

总结

以上是 iOS UIPickerView的简单封装示例 的全部内容, 来源链接: utcz.com/z/323784.html

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