swift appearanceWhenContainedIn:(version1.2 xcode6.4)

swift1.2にはocでの対応方法はありません.

+ (instancetype)appearanceWhenContainedIn:(Class <UIAppearanceContainer>)ContainerClass, ... NS_REQUIRES_NIL_TERMINATION;

解決方法:
swiftプロジェクトでocクラスを新規作成するには、次のようにします.

#import <UIKit/UIKit.h>

@interface UIView (UIAppearance_Swift)
+ (instancetype)ls_appearanceWhenContainedWithin: (NSArray *)containers;

@end

 

#import "UIView+UIAppearance_Swift.h"

@implementation UIView (UIAppearance_Swift)
+ (instancetype)ls_appearanceWhenContainedWithin: (NSArray *)containers
{
    NSUInteger count = containers.count;
    NSAssert(count <= 10, @"The count of containers greater than 10 is not supported.");
    
    return [self appearanceWhenContainedIn:
            count > 0 ? containers[0] : nil,
            count > 1 ? containers[1] : nil,
            count > 2 ? containers[2] : nil,
            count > 3 ? containers[3] : nil,
            count > 4 ? containers[4] : nil,
            count > 5 ? containers[5] : nil,
            count > 6 ? containers[6] : nil,
            count > 7 ? containers[7] : nil,
            count > 8 ? containers[8] : nil,
            count > 9 ? containers[9] : nil,
            nil];
}
@end

swift呼び出しでいいです.
 
BTW:
この方法は、xcode 7 beta、swift 2で提供されます.

    @available(iOS 9.0, *)
    static func appearanceWhenContainedInInstancesOfClasses(containerTypes: [AnyObject.Type]) -> Self