Objective C Chaining calls

Cause

When used on a certain day DKChainableAnimationKit , you can write the following code:

view.animation.rotate(180).anchorTopLeft.thenAfter(1.0).rotate(90).anchorCenter.animanimation

Coincidentally. Masonryactually, it's the same thing.

make.right.equalTo(self.view).with.offset(-10);

Principle

Look at the code, in fact, through a realization of all methods Chaining Method Object , each method will return a ' Block
, 这个返回类型为the parameters for block Chaining Method Object ， block are the type of arguments you want to pass in.

@interfaceChainingmethodobject:nsobject-(Chainingmethodobject * (^) (void)) doA;-( Chainingmethodobject * (^) (nsinteger i)) dob;-(Chainingmethodobject * (^) (nsstring* str") doc;-(Chainingmethodobject * (^) (nsstring* str, nsarray* Array)) DoD;  @end  @implementation chainingmethodobject-(Chainingmethodobject * (^) (NSInteger i)) doB{return ^id (NSInteger i) {//do actual stuff related with B return self;}; ... Other methods like  @end           

Usually, there ChainingMethodObject will be, delegate depending on the actual use of the situation, such as the animation library DKChainableAnimationKit , animation there is a weak var view:UIView pointer to the UIView so that the target view operation.

@implementation ChainingMethodObject- (id) initWithObject:(id)obj{ self = [super init]; _delegate = obj; return self;}@end

@interface HostObject()ChainingMethodObject * _cObj;@end@implementation HostObject (ChainingMethodObject)- (ChainingMethodObject *) getChainingMethodObject{ if (!_cObj) _cObj = [[ChainingMethodObject alloc] initWithObject:self]; return _cObj;}@end

Then you can:

HostObject* hostObject = [HostObject new];[hostOjbect getChainingMethodObject].doA.doC(@"Hi there!").doD(@"Hello",@[@1,@2]).doB(100).doA;

Reference

Dkchainableanimationkit

Masonry

Objective C Chaining calls