OC 单利用法

SCCOrderConfig.h 如下

#import <Foundation/Foundation.h>

@interface SCCOrderConfig : NSObject
+ (instancetype)sharedInstance;
@property (nonatomic, strong) NSDictionary *userInfo;
@property (nonatomic) BOOL isWindmill;
@property (nonatomic, copy) NSString *payerId;
@property (nonatomic, copy) NSString *payerType;
@property (nonatomic) BOOL hasPayAuth;
@end

SCCOrderConfig.m

#import "SCCOrderConfig.h"

@implementation SCCOrderConfig

+ (instancetype)sharedInstance {
    static id sharedInstance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedInstance = [[[self class] alloc] init];
    });
    return sharedInstance;
}

@end