1.block使用步驟:
1>.有兩個控制器,主動傳值或者提供方法的控制器A,接受值的控制器B
2>.讓A控制器typedef void(^myBlock)(),然后copy一個myBlock類型的屬性:
@property(nonatomic ,copy) myBlock block;
3>.在B控制器中創(chuàng)建A控制器,然后調(diào)用A控制器的方法
4>.在A控制器方法中,記錄block:self.block = block;
5>.在合適的地方調(diào)用block:self.block(poiResultList.poiInfoList);
6>.調(diào)用以后block參數(shù)里邊已經(jīng)有值,這個時候在B控制器中調(diào)用A控制器的方法中參數(shù)block開始執(zhí)行,并且block中參數(shù)也已經(jīng)有值.
2.block原理篇:
1>.誰要傳值,誰聲明和定義block以及把block作為參數(shù)的方法
2>.傳值方記錄下來block,在合適的時候調(diào)用
3>.接受值方,調(diào)用方法,等傳值方調(diào)用block的時候才會在代碼塊中拿到block傳過來的參數(shù)值.
3.demo
#import"TSYBaiduTool.h"
@interfaceTSYBaiduTool()
@property(nonatomic,copy) Blockblock;
/** poi檢索對象*/
@property(nonatomic,strong)BMKPoiSearch*searcher;
@end
@implementationTSYBaiduTool
single_implementation(TSYBaiduTool)
- (void)getPoiWithCeneter:(CLLocationCoordinate2D)centerkey:(NSString*)key Result:(Block)block{
//記錄block self.block=block;
//初始化檢索對象 _searcher=[[BMKPoiSearch alloc] init];
_searcher.delegate=self;
//發(fā)起檢索
BMKNearbySearchOption*option = [[BMKNearbySearchOption alloc] init];
option.pageIndex=0; option.pageCapacity=20; option.location= center; option.keyword= key;
BOOLflag = [_searcherpoiSearchNearBy:option];
if(flag){NSLog(@"周邊檢索發(fā)送成功");}else
{NSLog(@"周邊檢索發(fā)送失敗");}
#import"TSYBaiduTool.h"
@interfaceTSYBaiduTool()
@end
@implementationTSYBaiduTool
- (void)addAnnotationCenter:(CLLocationCoordinate2D)centertitle:(NSString*)title subTitle:(NSString*)subTile toMapView:(BMKMapView*)mapView{
//添加一個PointAnnotation
BMKPointAnnotation* annotation = [[BMKPointAnnotation alloc] init];
annotation.coordinate= center;
annotation.title= title;
annotation.subtitle= subTile;
[mapViewaddAnnotation:annotation]; }
#import"TSYBaiduTool.h"
@interfaceTSYBaiduTool()
@end
@implementationTSYBaiduTool
#pragmamark - BMKPoiSearchDelegate
//實(shí)現(xiàn)PoiSearchDeleage處理回調(diào)結(jié)果
-(void)onGetPoiResult:(BMKPoiSearch*)searcherresult:(BMKPoiResult*)poiResultListerrorCode:(BMKSearchErrorCode)error{
if(error ==BMK_SEARCH_NO_ERROR) {
//在此處理正常結(jié)果
self.block(poiResultList.poiInfoList);
} else if(error ==BMK_SEARCH_AMBIGUOUS_KEYWORD){
//當(dāng)在設(shè)置城市未找到結(jié)果都毒，但在其他城市找到結(jié)果時圈浇，回調(diào)建議檢索城市列表
//result.cityList; NSLog(@"起始點(diǎn)有歧義"); }else{
NSLog(@"抱歉旋恼，未找到結(jié)果--%zd", error);}
}
@end
#import"Singleton.h"
#import typedef void(^Block) (NSArray*result);
@interfaceTSYBaiduTool :NSObject
single_interface(TSYBaiduTool)
-(void)getPoiWithCeneter:(CLLocationCoordinate2D)centerkey:(NSString*)key Result:(Block)block;
-(void)addAnnotationCenter:(CLLocationCoordinate2D)centertitle:(NSString*)title subTitle:(NSString*)subTile toMapView:(BMKMapView*)mapView;
@end
#import"ViewController.h"
#import"TSYBaiduTool.h"
@interfaceViewController()
@property(weak,nonatomic) IBOutlet BMKMapView*mapView;
@end
@implementationViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.mapView.delegate=self;
}
#pragmark - BMKMapViewDelegate
/**
*長按地圖時調(diào)用
* @param mapView 地圖
* @param coordinate點(diǎn)對應(yīng)的經(jīng)緯度
*/
-(void)mapview:(BMKMapView*)mapView onLongClick:(CLLocationCoordinate2D)coordinate{
//調(diào)整地圖顯示區(qū)域
BMKCoordinateSpanspan = BMKCoordinateSpanMake(0.075418,0.051922);
BMKCoordinateRegionregion = BMKCoordinateRegionMake(coordinate, span);
[mapViewsetRegion:regionanimated:YES];
//poi檢索
[[TSYBaiduToolsharedTSYBaiduTool]getPoiWithCeneter:coordinatekey:@"小吃"Result:^(NSArray *result) {
[resultenumerateObjectsUsingBlock:^(BMKPoiInfo*_Nonnullobj,NSUIntegeridx,BOOL*_Nonnullstop) {
//添加大頭針
[[TSYBaiduToolsharedTSYBaiduTool]addAnnotationCenter:obj.pttitle:obj.namesubTitle:obj.addresstoMapView:self.mapView];
}];
}];
}
@end