iOS 常用block OC与swift对比

OC

//无参block
@property(nonatomic,strong) void (^clickBlock0)(void);
//有参block
@property(nonatomic,strong) void (^clickBlock1)(NSString*text, NSString*text2);
//带block的方法
- (void)requestSuccess:(void (^)(NSString*successText))success error:(void (^)(NSString*errorText, NSString*errorText2))error{
}

swift

//无参block
var clickBlock0: (() -> Void)?
//有参block
var clickBlock1: ((String, String) -> Void)?//定义

self.clickBlock1?("a","b")//赋值
 
self.clickBlock1 = { (param1: String, param2: String) in
//调用
  print("接收到的参数是: \(param1) 和 \(param2)")
}

//带block的方法
func performRequest(success: @escaping (String) -> Void, error: @escaping (String, String) -> Void)  {
}

//赋值
func performRequest(success: @escaping (String) -> Void, error: @escaping (String, String) -> Void)  {
  let a = arc4random_uniform(2)
  print(a)
  if (a == 0){
    DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(2)) {
    success("1111") 
  }
 } else {
      DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(2)) {
      error("222","3333")
    }
  } 
}

//调用
performRequest(success: { successText in
  print("Success: \(successText)")
}, error: { error, errorText in
  print("Error: \(error), Error Text: \(errorText)")
})