iOS 链式编程

#import "AppDelegate.h"
#import "ViewController.h"


@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   
    ViewController *v =[[ViewController alloc]init];
    ViewController *(^a)(UIColor *c) = [v item];
    a([UIColor redColor]);
    
    return YES;
}

@interface ViewController : UIViewController



-(ViewController* (^)(UIColor *))item;

@implementation ViewController

-(ViewController* (^)(UIColor *))item
{
    
    return ^(UIColor *color){
        
        
        return self;
    };
    
}

参考:http://www.jianshu.com/p/620b6ffd2050