使用iOS 7重用UIPickerView中的视图 [英] Reusing view in UIPickerView with iOS 7
问题描述
编辑12-14-2015 ：在iOS 7，iOS 8，iOS 9上再次频繁报告此问题....我认为Apple不再需要此控件，应该禁止我们使用它而不是让这么大的错误
EDIT 12-14-2015 : This problem is again frequently reported on iOS 7, iOS 8, iOS 9.... I think Apple want not of this control anymore, and should just forbid us to use it instead of let such a major bug
我使用UIPickerView和从Xib加载的自定义视图。
我使用的方法
I use a UIPickerView with custom views loaded from a Xib. I was using the method
-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row
forComponent:(NSInteger)component reusingView:(UIView *)view
从UIPickerViewDelegate到重用我的观点。
from UIPickerViewDelegate to reuse my views.
使用iOS 6，我的UIPickerview工作正常，我的视图可以重复使用。
With iOS 6, my UIPickerview works perfectly and my views are reused.
从iOS 7开始，reusingView总是为零，所以我需要为每一行加载NIB（我有250行）。我的观点正在做一些处理，所以它可以占用一小部分内存，但x250 =大内存泄漏。
Since iOS 7, the reusingView is always nil, so I need to load the NIB for each row (I have 250 rows). My views are doing some treatments so it can take a little part of memory but x250 = big memory leak.
为了确定问题是什么，我做了一个简单的项目与UILabel：
To be sure of what the problem is, I did a simple project with a UILabel :
-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
UILabel *label = (UILabel *)view;
if(view == nil) {
label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, pickerView.frame.size.width, 76)];
}
else {
NSLog(@"*******************************************************");
}
NSLog(@"Current inndex : %i",row);
label.text = [NSString stringWithFormat:@"TITRE %i", row];
return label;
}
使用iOS 6，我的观点被正确重用：
With iOS 6, my views are correctly reused :
2013-12-17 14：27：25.395 EssaiReusedViewPicker [261：907]当前的指数
：220 2013-12-17 14：27：25.396 EssaiReusedViewPicker [261：907]
**************************************** *************** 2013-12-17 14：27：25.397 EssaiReusedViewPicker [261：907]当前的指数：221
2013-12-17 14：27：25.404 EssaiReusedViewPicker [261：907]
***************************************** ************** 2013-12-17 14：27：25.407 EssaiReusedViewPicker [261：907]当前的指数：222
2013-12-17 14：27：25.409 EssaiReusedViewPicker [ 261：907]
****************************************** ************* 2013-12-17 14：27：25.410 EssaiReusedViewPicker [261：907]当前的指数：223
2013-12-17 14：27：25.411 EssaiReusedViewPicker [261 ：907]
******************************************* ************ 2013-12-17 14：27：25.412 EssaiReusedViewPicker [261：907]当前的索引： 224
2013-12-17 14：27：25.414 EssaiReusedViewPicker [261：907]
************************* ****************************** 2013-12-17 14：27：25.415 EssaiReusedViewPicker [261：907]当前的指数：225
2013-12-17 14：27：25.420 EssaiReusedViewPicker [261：907]
************************** ***************************** 2013-12-17 14：27：25.424 EssaiReusedViewPicker [261：907]当前的指数：227
2013-12-17 14：27：25.425 EssaiReusedViewPicker [261：907]
2013-12-17 14:27:25.395 EssaiReusedViewPicker[261:907] Current inndex : 220 2013-12-17 14:27:25.396 EssaiReusedViewPicker[261:907] ******************************************************* 2013-12-17 14:27:25.397 EssaiReusedViewPicker[261:907] Current inndex : 221 2013-12-17 14:27:25.404 EssaiReusedViewPicker[261:907] ******************************************************* 2013-12-17 14:27:25.407 EssaiReusedViewPicker[261:907] Current inndex : 222 2013-12-17 14:27:25.409 EssaiReusedViewPicker[261:907] ******************************************************* 2013-12-17 14:27:25.410 EssaiReusedViewPicker[261:907] Current inndex : 223 2013-12-17 14:27:25.411 EssaiReusedViewPicker[261:907] ******************************************************* 2013-12-17 14:27:25.412 EssaiReusedViewPicker[261:907] Current inndex : 224 2013-12-17 14:27:25.414 EssaiReusedViewPicker[261:907] ******************************************************* 2013-12-17 14:27:25.415 EssaiReusedViewPicker[261:907] Current inndex : 225 2013-12-17 14:27:25.420 EssaiReusedViewPicker[261:907] ******************************************************* 2013-12-17 14:27:25.424 EssaiReusedViewPicker[261:907] Current inndex : 227 2013-12-17 14:27:25.425 EssaiReusedViewPicker[261:907]
但是对于iOS 7，它是一个全部-new story ...：
But with iOS 7, it's an all-new story... :
2013-12-17 14:36:09.555 EssaiReusedViewPicker[7209:70b] Current inndex : 0
2013-12-17 14:36:09.557 EssaiReusedViewPicker[7209:70b] Current inndex : 1
2013-12-17 14:36:09.557 EssaiReusedViewPicker[7209:70b] Current inndex : 2
2013-12-17 14:36:09.560 EssaiReusedViewPicker[7209:70b] Current inndex : 0
2013-12-17 14:36:09.560 EssaiReusedViewPicker[7209:70b] Current inndex : 1
2013-12-17 14:36:09.561 EssaiReusedViewPicker[7209:70b] Current inndex : 2
2013-12-17 14:36:09.563 EssaiReusedViewPicker[7209:70b] Current inndex : 0
2013-12-17 14:36:09.563 EssaiReusedViewPicker[7209:70b] Current inndex : 1
2013-12-17 14:36:09.564 EssaiReusedViewPicker[7209:70b] Current inndex : 2
2013-12-17 14:36:09.566 EssaiReusedViewPicker[7209:70b] Current inndex : 0
2013-12-17 14:36:09.567 EssaiReusedViewPicker[7209:70b] Current inndex : 1
2013-12-17 14:36:09.567 EssaiReusedViewPicker[7209:70b] Current inndex : 2
2013-12-17 14:36:09.568 EssaiReusedViewPicker[7209:70b] Current inndex : 1
2013-12-17 14:36:09.568 EssaiReusedViewPicker[7209:70b] Current inndex : 2
2013-12-17 14:36:09.569 EssaiReusedViewPicker[7209:70b] Current inndex : 0
2013-12-17 14:36:09.569 EssaiReusedViewPicker[7209:70b] Current inndex : 1
2013-12-17 14:36:14.172 EssaiReusedViewPicker[7209:70b] Current inndex : 3
2013-12-17 14:36:14.350 EssaiReusedViewPicker[7209:70b] Current inndex : 3
2013-12-17 14:36:14.351 EssaiReusedViewPicker[7209:70b] Current inndex : 2
2013-12-17 14:36:14.367 EssaiReusedViewPicker[7209:70b] Current inndex : 4
2013-12-17 14:36:14.667 EssaiReusedViewPicker[7209:70b] Current inndex : 4
2013-12-17 14:36:14.668 EssaiReusedViewPicker[7209:70b] Current inndex : 3
2013-12-17 14:36:14.700 EssaiReusedViewPicker[7209:70b] Current inndex : 5
2013-12-17 14:36:15.067 EssaiReusedViewPicker[7209:70b] Current inndex : 5
2013-12-17 14:36:15.067 EssaiReusedViewPicker[7209:70b] Current inndex : 4
2013-12-17 14:36:15.083 EssaiReusedViewPicker[7209:70b] Current inndex : 6
2013-12-17 14:36:15.367 EssaiReusedViewPicker[7209:70b] Current inndex : 6
2013-12-17 14:36:15.367 EssaiReusedViewPicker[7209:70b] Current inndex : 5
2013-12-17 14:36:15.400 EssaiReusedViewPicker[7209:70b] Current inndex : 7
2013-12-17 14:36:16.416 EssaiReusedViewPicker[7209:70b] Current inndex : 7
那有什么不对？ iOS或...？
So what's wrong? iOS or ...?
推荐答案
我已向Apple技术支持部门报告了我的问题。他们确认了这个错误：
I have reported my problem to Apple Technical Support. They confirm the bug :
iOS 6和7中的行为确实存在差异。
There does indeed seem to be a difference between the behavior in iOS 6 and 7.
他们要求我报告bug报告工具的错误。现在，只需等待修复：）
They ask me to report a bug on the bugreport tool. Now, just wait for the fix :)
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