Notes in iOS

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1.当导入第三方库出现不支持ARC模式，可以在项目-》Build Phases中对第三方类文件添加Compiler Flags(-fno-objc-arc)2.获取UITableViewCell中所有子控件 // 获取当前tableView中的所有cell NSArray *array = [self.tableView visibleCells]; for (NSInteger i = 0; i < array.count; i++) {        // 判断是否是自定义的chatBgCell         if ([[array[i] class] isSubclassOfClass:[chatBgCell class]]) {             // 获取cell中所有子控件             NSArray *array1 = [[array[i] contentView] subviews];             for (UIImageView *im in array1) {                 if (im.subviews) {                     for (UIImageView *imSub in im.subviews) {                         if ([imSub.class isSubclassOfClass:[UIImageView class]]) {                             [imSub removeFromSuperview];                         }                     }                 }             }         }     }