UIPickerView的簡單封裝
在iOS實際項目中，經(jīng)常會出現(xiàn)界面中多個地方需要使用UIPickerView,如果在每個需要用到的地方都創(chuàng)建一個UIPickerView不僅更耗性能，而且還會讓你的代碼變得更加雜亂、冗余，因此我在這里向大家介紹一下我對UIPickerView的一些簡單封裝。
所需屬性
/** pickerView/
@property (nonatomic, strong) UIPickerView pickerView;
/ pickerView背景/
@property (nonatomic, strong) UIView pickerBackGroundView;
/ 背景/
@property (nonatomic, strong) UIView backGroundView;
/ 確認(rèn)按鈕/
@property (nonatomic, strong) UIButton sureButton;
/ 取消按鈕/
@property (nonatomic, strong) UIButton cancelButton;
/ 單列pickerView/
@property (nonatomic, strong) NSMutableArray slDataArray;
/ 雙列pickerView*/
@property (nonatomic, strong) NSMutableArray *mulDataArray;
如果只需要一列的話，只需要傳入一個數(shù)據(jù)數(shù)組:slDataArray,如果需要兩行，則兩個數(shù)組都需要賦值。
實現(xiàn)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];
}
}
這里根據(jù)兩個數(shù)組來初始化pickerView的內(nèi)容，即判斷第二個數(shù)組(mulDataArray)是否有數(shù)據(jù)，有數(shù)據(jù)的話代表加載兩列的pickerView，否則加載一列。
功能實現(xiàn)
-(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];
}
第一個方法是只有一列的pickerView初始化是讓其選中哪行，第二個則是兩列的選擇方法。
-(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, SCREENHEIGHT -220, SCREENWIDTH, 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, SCREENHEIGHT, SCREENWIDTH, 220);
} completion:^(BOOL finished) {
[self.backGroundView removeFromSuperview];
[self.pickerBackGroundView removeFromSuperview];
self.isPickerShow = NO;
}];
}
}
}
這個方法是顯示或者隱藏pickerView,通過動畫的方式，背景慢慢變黑或者透明，pickerView從下往上出現(xiàn)或者從上往下消失。
-(void)pickerViewReloadData{
[self.pickerView reloadAllComponents];
}
刷新pickerView數(shù)據(jù)，加載另一個pickerView時，調(diào)用該方法刷新。
