1.屬性用法

^ 后面就是block的名稱，必須是copy

#import <UIKit/UIKit.h>
#import <SCCUserInterface/SCCTableViewCellProtocol.h>
#import "CNNOrderButtonView.h"

@interface CNNCarOrderCell : UITableViewCell <SCCTableViewCellProtocol>

+ (CGFloat)cellHeightWithItem:(id)item width:(CGFloat)width;

@property (nonatomic, copy) void (^buttonTappedBlock)(NSInteger index, CNNOrderButtonActionType type);

@end

2.類外面申明，成為一種數(shù)據(jù)類型

(^CNNCloseLocationBlock) CNNCloseLocationBlock成為新的數(shù)據(jù)類型，即函數(shù)指針

#import <Foundation/Foundation.h>
typedef void (^CNNCloseLocationBlock)(NSDictionary *dict);

@interface CNNCloseCarLocationManager : NSObject
    
@property (nonatomic,copy) CNNCloseLocationBlock locationBlock;
    
@property (nonatomic,copy) void(^location)(NSError *error,NSDictionary*geolocation);
    
+ (instancetype)manager NS_SWIFT_NAME(sharedInstance());
    
- (void)startUpdatingLocation;
    
- (void)setGetLocationBlock:(void(^)(NSDictionary * dic))block;

- (void)setGetGeoLocationBlock:(void(^)(NSError *error,NSDictionary*geolocation))block;
@end

3.方法中的參數(shù)block用法

(^block xx) block名稱從括號(hào)中寫在外面成為參數(shù)

- (void)setGetLocationBlock:(void(^)(NSDictionary * dic))block;

總結(jié): 一般情況(^)后面都會(huì)跟block名稱，參數(shù)除外