之前发现了一种类似block串行执行的开发方式，今天终于不忙了就简单写一下做个笔记
链式调用
其实很简单，需要注意的就是相应对象的返回值，如下拿 person 和boy两个对象举例，最后实现 person.person(NO).strongMan(@"强壮的小男孩").boy(@"小男孩儿开始说").speak(@"我想回家");
Person.h
#import <Foundation/Foundation.h>
@class Boy;
@interface Person : NSObject
@property (nonatomic,readonly) Person *(^person)(BOOL enable);
@property (nonatomic,readonly) Person *(^strongMan)(NSString *str);
@property (nonatomic,readonly) Boy *(^boy)(NSString *str);
@end
Person.m
#import "Person.h"
#import "Boy.h"
@implementation Person
-(Person *(^)(BOOL))person{
return ^(BOOL enable){
NSLog(@"Person Say:%d\n",enable);
return self;
};
}
-(Person *(^)(NSString *))strongMan{
return ^(NSString *str){
NSLog(@"%@\n",str);
return self;
};
}
-(Boy *(^)(NSString *))boy{
return ^(NSString *str){
NSLog(@"%@\n",str);
return [[Boy alloc]init];
};
}
@end
boy.h
#import <Foundation/Foundation.h>
@interface Boy : NSObject
@property (nonatomic,readonly)Boy *(^speak)(NSString *speakStr);
@end
boy.m
#import "Boy.h"
@implementation Boy
-(Boy *(^)(NSString *))speak{
return ^(NSString *speakStr){
NSLog(@"speak:%@\n",speakStr);
return self;
};
}
@end
vc调用--------------------------------------------------
- (void)viewDidLoad {
[super viewDidLoad];
person.person(NO).strongMan(@"强壮的小男孩").boy(@"小男孩儿开始说").speak(@"我想回家");
}
打印结果
一般的使用到此就结束了，下面来稍微加点难度，前面的我们都看到了，都是正向传值，都是调用方直接告诉被调用方要干什么什么，那么我们如果需要调用方回传一些数据做处理呢，大家自己思考一下再往下看
思路是这样的，既然要反向且又想链式，那么自然想到了block，我们在被调用方的参数中修改参数为block是否能实现呢，继续往下看
拿系统定位功能CLLocationManager来做例子，调用定位，我们首先要检查权限、设置参数、开始定位、然后定位代理成功回调处理、失败处理这几个功能，我们最终的实现结果需要是这样的
self.locationManager.checkAuthorization(NO).startLocation().locationSuccess(^(NSDictionary *addressDict) {
NSLog(@"定位成功");
}).locationError(^(NSError *error){
NSLog(@"定位失败");
});
1.首先我们声明这几个block
###JoyLocationManager.h
@property (nonatomic,readonly)JoyLocationManager *(^checkAuthorization)(BOOL backGroundModel);
@property (nonatomic,readonly)JoyLocationManager *(^startLocation)();
@property (nonatomic,readonly)JoyLocationManager *(^stopLocation)();
//参数为idblock类型(我这是定义的id类型参数的回调)
@property (nonatomic,copy)JoyLocationManager *(^locationSuccess)(IDBLOCK block);
//参数为idblock类型(我这是定义的error类型参数的回调)
@property (nonatomic,copy)JoyLocationManager *(^locationError)(ERRORBLOCK block);
2.这几个block
###JoyLocationManager.m
#pragma mark 检查权限
-(JoyLocationManager *(^)(BOOL))checkAuthorization{
return ^(BOOL backGroundModel){
[self checkAuthorStateAndSetBackModel:backGroundModel];//检查权限并设置是否后台运行模式
return self;
};
}
#pragma mark 开始定位
-(JoyLocationManager *(^)())startLocation{
return ^(){
[self startManagerLocation];//开始定位
return self;
};
}
#pragma mark 结束定位
-(JoyLocationManager *(^)())stopLocation{
return ^(){
[self stopManagerLocation]; //结束定位
return self;
};
}
#pragma mark 定位成功
-(JoyLocationManager *(^)(IDBLOCK block))locationSuccess{
return ^(IDBLOCK block){
//runtime关联对象，定位成功代理中回调参数
objc_setAssociatedObject(self, _cmd, block, OBJC_ASSOCIATION_COPY);
return self;
};
}
#pragma mark 定位失败
-(JoyLocationManager *(^)(ERRORBLOCK))locationError{
return ^(ERRORBLOCK block){
//runtime关联对象，定位失败代理中回调参数
objc_setAssociatedObject(self, _cmd, block, OBJC_ASSOCIATION_COPY);
return self;
};
}
#pragma mark 定位代理
//CLLocation这个类里面包括的一些常用的位置信息有经度、纬度、海拔、速度、精确度
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations{
//定位成功进行地理反编码，可以改进一下考虑自行加入到链中
[self reverseGEOCodeLocation:locations.firstObject];
[self stopManagerLocation];
}
//定位失败
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
//拿到前面关联的block并回调参数
ERRORBLOCK successBlock = objc_getAssociatedObject(self, @selector(locationError));
successBlock?successBlock(error):nil;
}
//反地理编码
- (void)reverseGEOCodeLocation:(CLLocation *)location{
CLGeocoder *revGeo = [[CLGeocoder alloc] init];
[revGeo reverseGeocodeLocation:location
completionHandler:^(NSArray *placemarks, NSError *error) {
if (!error && [placemarks count] > 0)
{
NSDictionary *dict =
[[placemarks objectAtIndex:0] addressDictionary];
IDBLOCK successBlock = objc_getAssociatedObject(self, @selector(locationSuccess));
successBlock?successBlock(dict):nil;
}else{
NSLog(@"ERROR: %@", error);
}
}];
}
到此可以试试了
self.locationManager.checkAuthorization(NO).startLocation().locationSuccess(^(NSDictionary *addressDict) {
NSLog(@"定位成功");
}).locationError(^(NSError *error){
NSLog(@"定位失败");
});
成功回走成功的回调，失败会走失败的回调，大家可以自行去试试把定位精度、headupdate、地理编码等试试加进来
