我已将我的项目转换为
Xcode 6,以便为iOS 8构建.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
我无法在项目中的任何位置找到contentInsetsFromFonts方法.此外,我甚至无法在网上任何地方找到它的参考,包括Apple的文档.我没有为这个UIViewController使用NIB,因此UI是在loadView方法中构建的:
- (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]中崩溃;它在loadView方法返回后崩溃.
解决方法
从
the
UIView
documentation开始:
Never change the delegate of this layer object.
删除此行:
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去做.