我想将UIPickerView中的白色背景更改为我自己的图像。
这个是可能的吗?
此外,我还设法使我的UIPickerView水平滚动而不是垂直滚动。现在,我想知道是否有任何方法来调整选择器视图的两行之间的间距?
我附上了一张图片来说明我的意思。
这是我的密码:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
arrayDays = [[NSMutableArray alloc] init];
[arrayDays addObject:@"ONSDAG"];
[arrayDays addObject:@"TORSDAG"];
[arrayDays addObject:@"FREDAG"];
[arrayDays addObject:@"LØRDAG"];
arrayDates = [[NSMutableArray alloc] init];
[arrayDates addObject:@"29. JUNI"];
[arrayDates addObject:@"30. JUNI"];
[arrayDates addObject:@"1. JULI"];
[arrayDates addObject:@"2. JULI"];
pickerViewDay = [[UIPickerView alloc] initWithFrame:CGRectZero];
[pickerViewDay setDelegate:self];
[pickerViewDay setShowsSelectionIndicator:NO];
CGAffineTransform rotate = CGAffineTransformMakeRotation(-M_PI/2);
rotate = CGAffineTransformScale(rotate, 0.25, 2.0);
[pickerViewDay setTransform:rotate];
[pickerViewDay setCenter:CGPointMake(self.view.frame.size.width/2, (pickerViewDay.frame.size.height/2)-3)];
[self.view addSubview:pickerViewDay];
// Adding selection indicator to pickerview
UIImage *selectorImage = [UIImage imageNamed:@"DayPickerView_SelectionIndicator.png"];
UIView *customSelector = [[UIImageView alloc] initWithImage:selectorImage];
[customSelector setFrame:CGRectMake(0, 0, 120, 74)];
[customSelector setCenter:CGPointMake(self.view.frame.size.width/2, customSelector.frame.size.height/2)];
[self.view addSubview:customSelector];
[customSelector release];
// Adding background to pickerview
UIImage *backgroundImage = [UIImage imageNamed:@"DayPickerView_Background.png"];
UIView *custombackground = [[UIImageView alloc] initWithImage:backgroundImage];
[custombackground setFrame:CGRectMake(0, 0, 320, 74)];
// [self.view addSubview:custombackground];
[custombackground release];
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
UIView *viewRow = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 150, 80)];
CGAffineTransform rotate = CGAffineTransformMakeRotation(3.14/2);
rotate = CGAffineTransformScale(rotate, 0.25, 2.0);
// Date
CGRect rectDate = CGRectMake(30, 0, 150, 80);
UILabel *date = [[UILabel alloc]initWithFrame:rectDate];
[date setTransform:rotate];
[date setText:[arrayDates objectAtIndex:row]];
[date setFont:[UIFont fontWithName:@"Arial-BoldMT" size:37.0]];
[date setShadowColor:[UIColor whiteColor]];
[date setShadowOffset:CGSizeMake(0, -1)];
[date setTextAlignment:UITextAlignmentCenter];
[date setBackgroundColor:[UIColor clearColor]];
[date setClipsToBounds:YES];
[viewRow addSubview:date];
// Day
CGRect rectDay = CGRectMake(-30, 0, 150, 80);
UILabel *day = [[UILabel alloc]initWithFrame:rectDay];
[day setTransform:rotate];
[day setText:[arrayDays objectAtIndex:row]];
[day setFont:[UIFont fontWithName:@"Arial-BoldMT" size:21.0]];
[day setTextColor:[UIColor colorWithRed:0.35 green:0.35 blue:0.35 alpha:1]];
[day setTextAlignment:UITextAlignmentCenter];
[day setBackgroundColor:[UIColor clearColor]];
[day setClipsToBounds:YES];
[viewRow addSubview:day];
return viewRow;
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [arrayDays objectAtIndex:row];
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
return [arrayDays count];
}
编辑1
对于RickiG (背景):
编辑2
对于RickiG:
发布于 2011-04-21 14:59:38
嗨,没有直接的方式来改变背景。您可以做的是让您在viewForRow特性中返回的视图具有它自己的背景(如果需要的话,随后在每一侧添加阴影)。您也可以去寻找viewWithTag:但这绝不是一个好主意,因为这可能会在未来的iOS版本中发生变化。
您实现viewForRow和TitleForRow有什么特殊的原因吗?我通常只是在这个委托方法中填充viewForRow的标签。
viewForRow能够重用选择器中的视图,就像UITableView一样,您应该测试"reusingView:(UIView *)视图“是否为零,如果没有,则无需再次绘制所有内容。只是填充标签。
我通常从不自定义选择器,如果我需要一些不是完全自定义的东西--我对UITableView进行了子类化,那么它就会更加灵活,并且可以做更多的选择器。
对于可以使用行的“高度”的间距,选择器将在viewForRow中对返回的视图进行居中,然后确保:
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
返回大于视图的值。
(持有og lykke;)
发布于 2012-03-15 16:48:26
我刚刚想出了如何在选择器视图中应用背景颜色或图像。希望能帮上忙。
只需在要选择器视图的文件中定义一个类别,如下所示:
@implementation UIPickerView(Extension)
-(void)drawRect:(CGRect)rect
{
NSArray* subviews = [self subviews];
for(UIView* view in subviews)
{
if([view isKindOfClass:[UITableView class]])
{
view.backgroundColor = appColor;
}
}
[super drawRect:rect];
}
@end
您可以进一步查看subviews
以获得更多的自定义。
发布于 2014-02-01 05:01:12
看起来这是一个旧线程,但是在iOS 7(可能更早的时候,我不确定),UIPickerViews有一个背景颜色属性,所以设置背景色很简单:
[pickerView setBackgroundColor:[UIColor whiteColor]];
由于UIColor colorWithPatternImage:,设置背景图像也同样简单。(请注意,如果图像小于UIPickerView,则模式将平铺。)
[pickerView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"someBackgroundImage.png"]]];
要修改组件宽度,可以实现委托方法widthForComponent,以便为每个组件设置不同的宽度。理论上,您应该能够添加一个空组件,并使用它的空白宽度来创建间隔,但我还没有尝试过这一点。
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component;
我还没有找到一种方法来改变组件之间的填充,这似乎是修改间隔的一个更好的方法,并且还允许您删除组件之间的~5 px间距,但是如果我能够找到一个,我会更新我的答案。
https://stackoverflow.com/questions/5744996
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