【发布时间】：2014-12-15 04:48:14
【问题描述】：
我们的用户在以下方法中经常遇到崩溃。崩溃总是发生在以下行之一：[lbl sizeToFit]（lbl 变量被重新初始化和重用。据我了解，这不会导致任何问题）。
这些崩溃只发生在 iOS8 上（同样的方法在 ios7 上使用了很长时间，没有任何问题）。我无法自己重现这次崩溃。 目前，我唯一的线索来自“sizeToFit”苹果文档：
..在某些情况下，如果视图没有超级视图，它可能会根据屏幕边界调整自身大小。因此，如果您希望给定视图根据其父视图调整自身大小，则应在调用此方法之前将其添加到父视图。
但是，我不明白这会如何产生错误的内存引用。
-(void)setUpHeaders:(NSInteger)fortype{
headers = [NSMutableArray array];
if(fortype == GROUP_BY_TIME){
for(int i=0;i<4;i++){
UIView* header = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 68)];
header.backgroundColor = [UIColor whiteColor];
[headers addObject:header];
}
int today = (int)[NSDate dayOfTheWeekOfDate:[NSDate date]];
int firstDayOfTheWeek = (int)[defaults integerForKey:FIRST_DAY_IF_THE_WEEK_KEY];
NSString* restOfTheWeek = nil;
if(today == ((firstDayOfTheWeek + 4) % 7) + 1) restOfTheWeek = MyLocalizedString(@"THE COMING WEEK", @"THE COMING WEEK") ;
else if(today == ((firstDayOfTheWeek + 5) % 7) + 1) restOfTheWeek = MyLocalizedString(@"REST OF NEXT WEEK", @"REST OF NEXT WEEK") ;
else restOfTheWeek = MyLocalizedString(@"REST OF THE WEEK", @"REST OF THE WEEK") ;
UILabel* lbl = [[UILabel alloc] initWithFrame:CGRectMake(10, 38, 300, 30)];
lbl.tag = 22;
lbl.font = XX_LARGE_VOLKS_FONT;
[lbl setBackgroundColor:[UIColor clearColor]];
[lbl setTextColor:[UIColor darkGrayColor]];
[lbl setText:MyLocalizedString(@"TODAY", @"TODAY") ];
[lbl sizeToFit];
[[headers objectAtIndex:0] addSubview:lbl];
lbl = [[UILabel alloc] initWithFrame:CGRectMake([MyLocalizedString(@"TODAY", @"TODAY") sizeWithFont:[UIFont fontWithName:@"Volkswagen-Serial-Medium-Regular" size:21]].width + 15, 41, 300, 30)];
lbl.tag = 2;
lbl.font = [UIFont fontWithName:@"Volkswagen-Regular" size:19];
[lbl setBackgroundColor:[UIColor clearColor]];
[lbl setTextColor:[UIColor darkGrayColor]];
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear fromDate:[NSDate date]];
[lbl setText:[NSString stringWithFormat:@" %@, %@ %d ",[[[NSLocale currentLocale] localeIdentifier] containSubString:@"he"] ? [[[NSDate date] dayOfTheWeekString] uppercaseString] : [[[NSDate date] threeLetterDayOfTheWeekString] uppercaseString],[NSDate abbriviatedMonthForDate:[NSDate date]],(int)[components day]]];
lbl.textAlignment = NSTextAlignmentCenter;
[lbl sizeToFit];
[[headers objectAtIndex:0] addSubview:lbl];
UIImageView *img;
img = [[UIImageView alloc] initWithFrame:CGRectMake(0, 67, 320, 1)];
[img setBackgroundColor:[UIColor darkGrayColor]];
img.alpha = 0.5;
img.tag = 3;
[[headers objectAtIndex:0] addSubview:img];
img = [[UIImageView alloc] initWithFrame:CGRectMake(lbl.frame.origin.x+2, 40, 1, 19)];
[img setBackgroundColor:[UIColor darkGrayColor]];
img.alpha = 0.5;
img.tag = 33;
[[headers objectAtIndex:0] addSubview:img];
lbl = [[UILabel alloc] initWithFrame:CGRectMake(10, 38, 300, 30)];
lbl.tag = 22;
lbl.font = XX_LARGE_VOLKS_FONT;
[lbl setBackgroundColor:[UIColor clearColor]];
[lbl setTextColor:[UIColor darkGrayColor]];
[lbl setText:MyLocalizedString(@"TOMORROW", @"TOMORROW")];
[lbl sizeToFit];
[[headers objectAtIndex:1] addSubview:lbl];
lbl = [[UILabel alloc] initWithFrame:CGRectMake([MyLocalizedString(@"TOMORROW", @"TOMORROW") sizeWithFont:[UIFont fontWithName:@"Volkswagen-Serial-Medium-Regular" size:21]].width + 15, 41, 200, 30)];
lbl.tag = 2;
lbl.font = [UIFont fontWithName:@"Volkswagen-Regular" size:19];
[lbl setBackgroundColor:[UIColor clearColor]];
[lbl setTextColor:[UIColor darkGrayColor]];
components = [[NSCalendar currentCalendar] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear fromDate:[NSDate dateWithTimeIntervalSinceNow:86400]];
[lbl setText:[NSString stringWithFormat:@" %@, %@ %d ",[[[NSLocale currentLocale] localeIdentifier] containSubString:@"he"] ? [[[[NSDate date] dateByAddingDays:1] dayOfTheWeekString] uppercaseString] : [[[[NSDate date] dateByAddingDays:1] threeLetterDayOfTheWeekString] uppercaseString],[NSDate abbriviatedMonthForDate:[[NSDate date] dateByAddingDays:1]],(int)[components day]]];
lbl.textAlignment = NSTextAlignmentCenter;
[lbl sizeToFit];
[[headers objectAtIndex:1] addSubview:lbl];
img = [[UIImageView alloc] initWithFrame:CGRectMake(0, 67, 320, 1)];
[img setBackgroundColor:[UIColor darkGrayColor]];
img.alpha = 0.5;
img.tag = 3;
[[headers objectAtIndex:1] addSubview:img];
img = [[UIImageView alloc] initWithFrame:CGRectMake(lbl.frame.origin.x+2, 40, 1, 19)];
[img setBackgroundColor:[UIColor darkGrayColor]];
img.alpha = 0.5;
img.tag = 33;
[[headers objectAtIndex:1] addSubview:img];
lbl = [[UILabel alloc] initWithFrame:CGRectMake(10, 38, 300, 30)];
lbl.tag = 2;
lbl.font = XX_LARGE_VOLKS_FONT;
[lbl setBackgroundColor:[UIColor clearColor]];
[lbl setTextColor:[UIColor darkGrayColor]];
[lbl setText:restOfTheWeek];
[[headers objectAtIndex:2] addSubview:lbl];
img = [[UIImageView alloc] initWithFrame:CGRectMake(0, 67, 320, 1)];
[img setBackgroundColor:[UIColor darkGrayColor]];
img.alpha = 0.5;
img.tag = 3;
[[headers objectAtIndex:2] addSubview:img];
lbl = [[UILabel alloc] initWithFrame:CGRectMake(10, 38, 300, 30)];
lbl.tag = 2;
lbl.font = XX_LARGE_VOLKS_FONT;
[lbl setBackgroundColor:[UIColor clearColor]];
[lbl setTextColor:[UIColor darkGrayColor]];
[lbl setText:MyLocalizedString(@"LATER", @"LATER")];
[[headers objectAtIndex:3] addSubview:lbl];
img = [[UIImageView alloc] initWithFrame:CGRectMake(0, 67, 320, 1)];
[img setBackgroundColor:[UIColor darkGrayColor]];
img.alpha = 0.5;
img.tag = 3;
[[headers objectAtIndex:3] addSubview:img];
lbl = (UILabel*)[[headers objectAtIndex:0] viewWithTag:2];
todayWeather = [[UIImageView alloc] initWithFrame:CGRectMake(lbl.frame.size.width + lbl.frame.origin.x-5, 38, 30, 25)];
[[headers objectAtIndex:0] addSubview:todayWeather];
lbl = (UILabel*)[[headers objectAtIndex:1] viewWithTag:2];
tomorrowWeather = [[UIImageView alloc] initWithFrame:CGRectMake(lbl.frame.size.width + lbl.frame.origin.x-5, 38, 30, 25)];
[[headers objectAtIndex:1] addSubview:tomorrowWeather];
[self gotWeather];
}
else{
NSMutableArray* labels = [[self getLabels] valueForKey:@"values"];
CGRect headerFrame, labelFrame, seperatorFrame;
if ([defaults integerForKey:DISPLAY_TYPE]==DisplayTypeNotes) {
headerFrame = CGRectMake(0, 0, 320, 60);
labelFrame = CGRectMake(10, 30, 300, 30);
seperatorFrame = CGRectMake(0, 59, 320, 1);
}else{
headerFrame = CGRectMake(0, 0, 320, 68);
labelFrame = CGRectMake(10, 38, 300, 30);
seperatorFrame = CGRectMake(0, 67, 320, 1);
}
for(int i=0;i<[labels count];i++){
UIView* header = [[UIView alloc] initWithFrame:headerFrame];
header.backgroundColor = [UIColor whiteColor];
UILabel* lbl = [[UILabel alloc] initWithFrame:labelFrame];
lbl.tag = 2;
lbl.font = XX_LARGE_VOLKS_FONT;
[lbl setBackgroundColor:[UIColor clearColor]];
[lbl setTextColor:[UIColor darkGrayColor]];
[lbl setText:[labels objectAtIndex:i]];
[header addSubview:lbl];
UIImageView *img;
img = [[UIImageView alloc] initWithFrame:seperatorFrame];
[img setBackgroundColor:[UIColor darkGrayColor]];
img.alpha = 0.5;
img.tag = 3;
[header addSubview:img];
[header bringSubviewToFront:lbl];
[headers addObject:header];
}
//add aditonale header for unlabeled tasks\notes
UIView* header = [[UIView alloc] initWithFrame:headerFrame];
header.backgroundColor = [UIColor whiteColor];
UILabel* lbl = [[UILabel alloc] initWithFrame:labelFrame];
lbl.tag = 2;
lbl.font = XX_LARGE_VOLKS_FONT;
[lbl setBackgroundColor:[UIColor clearColor]];
[lbl setTextColor:[UIColor darkGrayColor]];
[lbl setText:MyLocalizedString(@"Not Labeled", @"Not Labeled")];
[header addSubview:lbl];
UIImageView *img;
img = [[UIImageView alloc] initWithFrame:seperatorFrame];
[img setBackgroundColor:[UIColor darkGrayColor]];
img.alpha = 0.5;
img.tag = 3;
[header addSubview:img];
[headers insertObject:header atIndex:0];
}
}
Thread : Crashed: com.apple.main-thread
0 UIKit 0x000000018c4f22a0 -[_UIViewAdditiveAnimationAction runActionForKey:object:arguments:] + 640
1 UIKit 0x000000018c4f228c -[_UIViewAdditiveAnimationAction runActionForKey:object:arguments:] + 620
2 QuartzCore 0x000000018bb80198 CA::Layer::set_bounds(CA::Rect const&, bool) + 408
3 QuartzCore 0x000000018bb7ff78 -[CALayer setBounds:] + 104
4 UIKit 0x000000018c70fa50 -[_UILabelLayer setBounds:] + 56
5 QuartzCore 0x000000018bb80c58 -[CALayer setFrame:] + 488
6 UIKit 0x000000018c70f9e4 -[_UILabelLayer setFrame:] + 56
7 UIKit 0x000000018c22de0c -[UIView(Geometry) setFrame:] + 292
8 UIKit 0x000000018c23d69c -[UILabel setFrame:] + 140
9 UIKit 0x000000018c23ea88 -[UIView(Geometry) sizeToFit] + 248
10 24me 0x00000001001e292c -[ViewController setUpHeaders:] (ViewController.m:3412)
11 24me 0x00000001001dfcac -[ViewController groupByTime] (ViewController.m:3146)
12 24me 0x00000001001df6a0 -[ViewController group] (ViewController.m:3071)
13 Foundation 0x0000000188970ea8 __NSFireDelayedPerform + 424
14 CoreFoundation 0x0000000187a6a210 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28
15 CoreFoundation 0x0000000187a69ec0 __CFRunLoopDoTimer + 888
16 CoreFoundation 0x0000000187a6790c __CFRunLoopRun + 1372
17 CoreFoundation 0x0000000187995664 CFRunLoopRunSpecific + 396
18 GraphicsServices 0x0000000190acf5a4 GSEventRunModal + 168
19 UIKit 0x000000018c29a4f8 UIApplicationMain + 1488
20 24me 0x00000001000642bc main (main.m:16)
21 libdyld.dylib 0x000000019875ea08 start + 4
【问题讨论】：
-
在 iOS8 中遇到与 sizeToFit 类似的问题：EXC_BAD_ACCESS (code=2, address=x52)
-
还有其他关于这个的发现吗？
-
您是否尝试过确保它在主线程上运行？我确定我最近遇到了类似的问题，但不是 100%，所以不想发布作为答案。
-
您是否考虑过将 addSubview 和 sizeToFit 交换为关注者？然后它会匹配苹果在文档中所说的内容。 [[headers objectAtIndex:0] addSubview:lbl]; [lbl sizeToFit];至于EXC_BAD_ACCESS，大部分苹果代码仍然运行MRC（pre-ARC），所以很容易运行int EXC_BAD_ACCESS，因为分配指针。
-
如果您的应用程序是多线程的，您可以尝试使用此工具来检测您的代码是否使用辅助线程中的 UIKit。如果确实如此，那么您将准确地知道在哪个时刻，您可以解决该问题。 gist.github.com/steipete/5664345
标签： objective-c ios8 uilabel exc-bad-access sizetofit