iOS 15 新特性适配

1、导航栏的性能做了优化，默认情况下，如果导航栏与视图没有折叠，导航栏的背景透明，如果系统检测到有重叠的话，会变成毛玻璃的效果

if (@available(iOS 13.0, *)) { UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init]; [appearance setShadowImage:[[UIImage alloc] init]]; [appearance setBackgroundColor:TAD_THM.navigationBackgroundColor]; // 隐藏分割线 设置一个透明或者纯色的图片 设置nil 或者 [UIImage new]无效 [appearance setBackgroundImage:[UIImage zt_imageWithPureColor:[UIColor whiteColor]]]; [appearance setShadowImage:[UIImage zt_imageWithPureColor:[UIColor whiteColor]]]; [[UINavigationBar appearance] setScrollEdgeAppearance: appearance]; } 

颜色转图片

+ (UIImage *)zt_imageWithPureColor:(UIColor *)color { UIGraphicsBeginImageContextWithOptions(CGSizeMake(3, 3), NO, [UIScreen mainScreen].scale); UIBezierPath* p = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, 3, 3)]; [color setFill]; [p fill]; UIImage* img = UIGraphicsGetImageFromCurrentImageContext(); return img; } + (UIImage *)zt_imageWithPureColor:(UIColor *)color size:(CGSize )size{ UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale); UIBezierPath* p = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, size.width, size.height)]; [color setFill]; [p fill]; UIImage* img = UIGraphicsGetImageFromCurrentImageContext(); return img; } 

2、UITableView新增了一条新属性：sectionHeaderTopPadding， 默认会给每一个section header 增加一个高度，当我们使用 UITableViewStylePlain 初始化UITableView的时候，能发现sectionHeader增高了22px。解决办法就是手动去除这个高度

if (@available(iOS 15.0, *)) { table.sectionHeaderTopPadding = 0; } 

3、UIImageWriteToSavedPhotosAlbum存储图片之后的回调不再返回图片了，会返回nil，如果在回调方法里面操作image有可能会直接Crash，目前的解决办法声明一个全局image去记录，后面再去操作

self.image = image; UIImageWriteToSavedPhotosAlbum(image,self,@selector(image:didFinishSavingWithError:contextInfo:), NULL); - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{ // self.image doing... }