UILabel导致应用程序在添加到视图时崩溃（仅限Xcode 6和iOS 8）
我已经将我的项目转换为Xcode 6，以便为iOS 8构build。但是，特定的UILabel会导致应用程序在添加到视图层次结构时崩溃。 这是我收到的唯一错误日志：
-[MyViewController _contentInsetsFromFonts]: unrecognized selector sent to instance 0x16d90da0 我一直无法find我的项目中的任何地方contentInsetsFromFonts方法。 另外，我还没有能够在网上find任何地方的参考，包括苹果的文档。 我没有使用这个UIViewController的NIB，所以UI是在loadView方法中构build的：
- (void)loadView { UIImage *trackImage = [UIImage imageNamed:@"sliderTrack.png"]; sliderBackground = [[UIImageView alloc] initWithImage:trackImage]; UIView *view = [[UIView alloc] initWithFrame:sliderBackground.frame]; [view addSubview:sliderBackground]; slider = [[UISlider alloc] initWithFrame:sliderBackground.frame]; CGRect sliderFrame = slider.frame; sliderFrame.size.width -= 46; slider.frame = sliderFrame; slider.center = sliderBackground.center; slider.backgroundColor = [UIColor clearColor]; [slider setMinimumTrackImage:[UIImage imageNamed:@"sliderMaxMinTrackImage.png"] forState:UIControlStateNormal]; [slider setMaximumTrackImage:[UIImage imageNamed:@"sliderMaxMinTrackImage.png"] forState:UIControlStateNormal]; UIImage *thumbImage = [UIImage imageNamed:@"cancel-slider.png"]; [slider setThumbImage:thumbImage forState:UIControlStateNormal]; slider.minimumValue = 0.0; slider.maximumValue = 1.0; slider.continuous = YES; slider.value = 0.0; // Set the slider action methods [slider addTarget:self action:@selector(sliderUp:) forControlEvents:UIControlEventTouchUpInside]; [slider addTarget:self action:@selector(sliderDown:) forControlEvents:UIControlEventTouchDown]; [slider addTarget:self action:@selector(sliderChanged:) forControlEvents:UIControlEventValueChanged]; NSString *labelText = @"label text"; UIFont *labelFont; NSString *osVersion = [[UIDevice currentDevice] systemVersion]; if ([osVersion floatValue] >= 7.0) { labelFont = [UIFont systemFontOfSize:22.0]; } else { labelFont = [UIFont systemFontOfSize:24.0]; } CGSize labelSize = [labelText sizeWithAttributes:[NSDictionary dictionaryWithObjectsAndKeys:labelFont, NSFontAttributeName, nil]]; label = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, labelSize.width, labelSize.height)]; CGFloat labelHorizontalCenter = slider.center.x + (thumbImage.size.width / 2); label.center = CGPointMake(labelHorizontalCenter, slider.center.y); // Set other label attributes and add it to the view label.textColor = [UIColor whiteColor]; label.textAlignment = NSTextAlignmentCenter; label.backgroundColor = [UIColor clearColor]; label.font = labelFont; label.text = labelText; [view addSubview:label]; [view addSubview:slider]; label.layer.delegate = self; self.view = view; }
该应用程序不会在[view addSubview:label] ; 它在loadView方法返回后崩溃。
从UIView文档 ：
永远不要改变这个图层对象的委托。
删除这一行：
label.layer.delegate = self;
无论你想在这里完成什么，你都需要以另一种方式来完成。