Ios 如何在包含多个组件的UIPickerView中为特定组件添加图像?
几个小时以来,我一直在尝试添加一个包含4个组件的Ios 如何在包含多个组件的UIPickerView中为特定组件添加图像?,ios,objective-c,ios7,uipickerview,Ios,Objective C,Ios7,Uipickerview,几个小时以来,我一直在尝试添加一个包含4个组件的UIPickerView。其中三个组件应该显示来自三个不同的NSArray的字符串数据,但对于第四个组件,我尝试添加图像 在另一本书中,我读到了这种方法: - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view { // ret
UIPickerView
。其中三个组件应该显示来自三个不同的NSArray
的字符串数据,但对于第四个组件,我尝试添加图像
在另一本书中,我读到了这种方法:
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
// return aUIView;
}
它返回UIView,在我的例子中是ImageView
我已经成功地显示了存储在images数组中的ImagesView,但前提是在picker视图中有一个组件
我如何将它与其他三个组件结合起来,它们不应该返回UIView,而只是返回一些字符串值
这是迄今为止我在.m
中得到的:
- (void)viewDidLoad
{
[super viewDidLoad];
// Four Arrays with some data
self.contractLevelArray = ...someStringObjects...
self.imageViewsWithImagesForSuitArray =...someUIImageViewObjectsWithImages...
self.doubleOrRedoubleArray = ...someStringObjects...
self.contractByPlayerArray = ...someStringObjects...
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 4;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (component == 0) {
return self.contractLevelArray.count;
} else if (component == 1) {
return self.imageViewsWithImagesForSuitArray.count;
} else if (component == 2) {
return self.contractByPlayerArray.count;
} else {
return self.doubleOrRedoubleArray.count;
}
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if (component == 0) {
return [self.contractLevelArray objectAtIndex:row];
} else if (component == 1) {
// For this component i want to return the UIImageViews for my images
} else if (component == 2) {
return [self.contractByPlayerArray objectAtIndex:row];
} else {
return [self.doubleOrRedoubleArray objectAtIndex:row];
}
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
// self.myImages is an array of UIImageView objects
UIView *myView = [self.imageViewsWithImagesForSuitArray objectAtIndex:row];
// first convert to a UIImage
UIGraphicsBeginImageContextWithOptions(myView.bounds.size, NO, 0);
[myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// then convert back to a UIImageView and return it
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
return imageView;
}
不能同时使用
viewForRow
和titleForRow
。在您的情况下,只需使用viewForRow
对于图像组件,返回图像视图。对于其他标签,请返回包含所需文本的标签。谢谢。这很有帮助。我花了一些时间才弄明白如何配置标签,但现在它开始工作了!:)