IOS开发（59）之Block Object的调用

1 前言
本文将介绍如何函数调用block object以及block object调用block object。

2 代码实例
testdemo.h

[plain]
#import <foundation/foundation.h> 
 
@interface testdemo : nsobject 
 
- (void) callsimpleblock; 
- (void) calltrimblock; 
@end 

#import <foundation/foundation.h>

@interface testdemo : nsobject

- (void) callsimpleblock;
- (void) calltrimblock;
@end
testdemo.m

 

[plain]
#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 

#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
main.m

 

[plain] view plaincopyprint?int main(int argc, const char * argv[]) 
{ 
 
    @autoreleasepool { 
         
        testdemo *test = [[testdemo alloc] init]; 
//        [test callsimpleblock]; 
        [test calltrimblock]; 
    } 
    return 0; 
} 

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

    @autoreleasepool {
       
        testdemo *test = [[testdemo alloc] init];
//        [test callsimpleblock];
        [test calltrimblock];
    }
    return 0;
}
运行结果

2013-05-10 06:53:50.893 callblockobjecttest[591:303] trimmed string = archy