在处理另一个UIPickerView时,模糊其中一行。
问题出现的原因是在使用UIPickerView时,当操作其中一个组件时,需要将另一个组件进行模糊处理。解决方法是使用viewForRow函数对未选中的视图进行模糊处理,然后在didSelectRow函数中对选中的视图进行取消模糊处理。下面是实现这一目的的代码示例:
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
let pickerView = UIPickerView()
var blurEffectView: UIVisualEffectView?
override func viewDidLoad() {
super.viewDidLoad()
pickerView.delegate = self
pickerView.dataSource = self
view.addSubview(pickerView)
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return 4
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 2
}
func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
let label = UILabel()
label.text = "Row \(row)"
// Apply blur effect to unselected views
if component != pickerView.selectedRow(inComponent: 0) {
let blurEffect = UIBlurEffect(style: .light)
blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView?.frame = label.bounds
label.addSubview(blurEffectView!)
}
return label
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
// Remove blur effect from selected view
for subview in pickerView.subviews {
if subview.subviews.contains(blurEffectView!) {
blurEffectView?.removeFromSuperview()
blurEffectView = nil
}
}
}
}
上述代码使用了UIPickerView的viewForRow和didSelectRow函数来实现对选中和未选中视图的模糊处理。在viewForRow函数中,判断当前组件是否为未选中组件,如果是,则为该视图应用模糊效果。在didSelectRow函数中,遍历所有的子视图,找到包含模糊效果视图的子视图并将其移除,从而取消模糊效果。
希望这个Objective-C的示例代码能对你有所帮助:
#import "ViewController.h" @interface ViewController ()@property (nonatomic, strong) UIPickerView *pickerView; @property (nonatomic, strong) UIVisualEffectView *blurEffectView; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; self.pickerView = [[UIPickerView alloc] init]; self.pickerView.delegate = self; self.pickerView.dataSource = self; [self.view addSubview:self.pickerView]; } - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component { return 4; } - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { return 2; } - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view { UILabel *label = [[UILabel alloc] init]; label.text = [NSString stringWithFormat:@"Row %ld", (long)row]; // Apply blur effect to unselected views if (component != [pickerView selectedRowInComponent:0]) { UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]; self.blurEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect]; self.blurEffectView.frame = label.bounds; [label addSubview:self.blurEffectView]; } return label; } - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { // Remove blur effect from selected view for (UIView *subview in pickerView.subviews) { if ([subview.subviews containsObject:self.blurEffectView]) { [self.blurEffectView removeFromSuperview]; self.blurEffectView = nil; } } } @end
这段Objective-C代码与之前的Swift代码实现了相同的功能,使用了UIPickerView的viewForRow和didSelectRow函数来处理选中和未选中视图的模糊效果。在viewForRow函数中,判断当前组件是否为未选中组件,如果是,则为该视图应用模糊效果。在didSelectRow函数中,遍历所有的子视图,找到包含模糊效果视图的子视图并将其移除,从而取消模糊效果。
希望这些代码对你有帮助!