为什么我的UIPickerView崩溃了? [英] Why Is My UIPickerView Crashing?
本文介绍了为什么我的UIPickerView崩溃了?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
使用UIPickerView加载视图时出现以下错误:
i am getting the following error when I load the view with my UIPickerView:
* 由于未捕获的异常'NSInvalidArgumentException'而终止应用程序,原因:'-[[NSCFNumber isEqualToString:]:无法识别的选择器已发送到实例0x5906000'
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFNumber isEqualToString:]: unrecognized selector sent to instance 0x5906000'
这是我所有与选择器相关的代码:
Here is all my code related to the picker:
-(void)viewDidLoad:
NSMutableArray * array = [[NSMutableArray alloc] initWithCapacity:700];
for ( int i = 1 ; i <= 100 ; i ++ )
[array addObject:[NSNumber numberWithInt:i]];
weightArray = array;
//[array release];
#pragma mark - Weight Picker
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component
{
return [weightArray count];
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
return [weightArray objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
// NSLog(@"Selected Color: %@. Index of selected color: %i", [weightArray objectAtIndex:row], row);
}
更新
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
if (thePickerView.tag==1)
{
//float weight = [[pickerArray objectAtIndex:row] intValue];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 300, 37)];
float weight = [[pickerArray objectAtIndex:row] floatValue];
label.text = [NSString stringWithFormat:@"%f lb", weight];
//label.text = [NSString stringWithFormat:@"%f lb", weight];
label.textAlignment = UITextAlignmentCenter;
label.backgroundColor = [UIColor clearColor];
label.font = [UIFont systemFontOfSize:30];
[label autorelease];
return label;
}
else
{
int reps = [[pickerArray objectAtIndex:row] intValue];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 300, 37)];
label.text = [NSString stringWithFormat:@"%d reps", reps];
label.textAlignment = UITextAlignmentCenter;
label.backgroundColor = [UIColor clearColor];
label.font = [UIFont systemFontOfSize:30];
[label autorelease];
return label;
}
}
推荐答案
Faisal,我认为问题出在
Faisal, I think problem lies
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
return [weightArray objectAtIndex:row];
}
在上述方法中... weightArray是NSNumber的数组.并且您将其视为字符串,您应该尝试遵循
in above method... weightArray is array of NSNumber. and you are treating it as string you should rather try following
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
int weight = [[weightArray objectAtIndex:row] intValue];
NSString *pickerTitle = [NSString stringWithFormat:@"%d",weight];
return pickerTitle;
}
关于选择器方法
#pragma mark - Weight Picker
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView
{
use like this...
if(thePickerView.tag==1)
{
return 1;
}
else if(thePickerView.tag==2)
{
return 2; //just for example...
}
else
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component
{
return [weightArray count];
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if(thePickerView.tag==1)
{
return [weightArray objectAtIndex:row];
}
else if(thePickerView.tag==1)
{
return ;//your other value and so on.....
}
}
谢谢
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