UIPickerView 自定义视图不可视化
我有自定义视图：
#import <UIKit/UIKit.h>
@interface materialView : UIView {
IBOutlet UIImageView * _img;
IBOutlet UILabel * _title;
}
- (id)initWithTitle:(NSString*)pTitle image:(UIImage *)pImage;
@end
然后
#import "materialView.h"
@implementation materialView
- (id)initWithTitle:(NSString*)pTitle image:(UIImage *)pImage {
CGRect frame = CGRectMake(0, 0, 295, 38);
self = [super initWithFrame:frame];
if (self) {
[_img setImage:pImage];
[_title setText:pTitle];
}
return self;
}
@end
我将此视图添加到我的 UIPickerView：
- (id)init {
self=[super init];
if (self) {
materialView * pl = [[materialView alloc] initWithTitle:@"Plastic" image:[UIImage imageNamed:@"aaa.jpeg"]];
materialView * gl = [[materialView alloc] initWithTitle:@"Glass" image:[UIImage imageNamed:@"bbb.jpeg"]];
_loadedItems = [[NSArray arrayWithObjects:pl, gl, nil] retain];
}
return self;
}
...
pickerView.dataSource = self;
pickerView.delegate = self;
...
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
return [_loadedItems objectAtIndex:row];
}
问题是，我的行为非常奇怪。我的视图未显示在选取器视图中。 任何人都可以帮助我吗？
I have custom view:
#import <UIKit/UIKit.h>
@interface materialView : UIView {
IBOutlet UIImageView * _img;
IBOutlet UILabel * _title;
}
- (id)initWithTitle:(NSString*)pTitle image:(UIImage *)pImage;
@end
and
#import "materialView.h"
@implementation materialView
- (id)initWithTitle:(NSString*)pTitle image:(UIImage *)pImage {
CGRect frame = CGRectMake(0, 0, 295, 38);
self = [super initWithFrame:frame];
if (self) {
[_img setImage:pImage];
[_title setText:pTitle];
}
return self;
}
@end
then I add this View to my UIPickerView:
- (id)init {
self=[super init];
if (self) {
materialView * pl = [[materialView alloc] initWithTitle:@"Plastic" image:[UIImage imageNamed:@"aaa.jpeg"]];
materialView * gl = [[materialView alloc] initWithTitle:@"Glass" image:[UIImage imageNamed:@"bbb.jpeg"]];
_loadedItems = [[NSArray arrayWithObjects:pl, gl, nil] retain];
}
return self;
}
...
pickerView.dataSource = self;
pickerView.delegate = self;
...
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
return [_loadedItems objectAtIndex:row];
}
Problem is, that I have quite strange behavior. My View don't show in Picker View.
Can any body help me?
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评论（1）
首先，在您的：
测试
_loadedItews和使用objectAtIndex:返回的对象不是nil？如果没有更多上下文，您的代码看起来很合理。还将自定义视图的 userInteractionEnabled 属性设置为 NO。似乎如果将其设置为 YES，则自定义视图会拦截触摸，并且选择器无法滚动到点击的行。
First, in your:
test that
_loadedItewsand the objects returned withobjectAtIndex:are notnil? Your code looks reasonable otherwise without more context.Also set your custom view's userInteractionEnabled property to NO. It seems that if it is set to YES then custom views intercept the touches and the picker can't scroll to the tapped row.