Block Object

1 前言

2 代码实例

#import <Foundation/Foundation.h>

@interface TestDemo : NSObject

- (void) callSimpleBlock;
- (void) callTrimBlock;
@end

#import "TestDemo.h"

@implementation TestDemo

/*************** 方法调用Block Object Start ***************/
void (^simpleBlock)(NSString *) = ^(NSString *paramString){
/* Implement the block object here and use the paramString parameter */
NSLog(@"%@",paramString);
};
- (void) callSimpleBlock{
simpleBlock(@"Archy");
}
/*************** 方法调用Block Object End ***************/

/*************** Block Object调用Block Object Start ***************/
NSString *(^trimString)(NSString *) = ^(NSString *inputString){
NSString *result = [inputString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
return result;
};

NSString *(^trimWithOtherBlock)(NSString *) = ^(NSString *inputString){
return trimString(inputString);
};
- (void) callTrimBlock{
NSString *trimmedString = trimWithOtherBlock(@" Archy ");
NSLog(@"Trimmed string = %@", trimmedString);
}
/*************** Block Object调用Block Object Start ***************/

@end

int main(int argc, const char * argv[])
{

@autoreleasepool {

TestDemo *test = [[TestDemo alloc] init];
//        [test callSimpleBlock];
[test callTrimBlock];
}
return 0;
}