block作为属性,作为参数,作为返回值各种情况演示

原文链接：http://blog.csdn.net/lybeen2007/article/details/48391339

////  ViewController.m//  block作为属性,作为参数各种情况演示////  Created by xiaobing on 15/9/12.//  Copyright (c) 2015年 xiaobing. All rights reserved.//#import "ViewController.h"#pragma mark - blcok作为属性@interface ViewController ()/**<没有返回值,没有参数的block*/@property (nonatomic, copy) void(^myBlock1)();/**<有返回值,没有参数的block*/@property (nonatomic, copy) int(^myBlock2)();/**<没有返回值,有参数的block*/@property (nonatomic, copy) void(^myBlock3)(int, int);/**<有返回值,有参数的block*/@property (nonatomic, copy) int (^myBlock4)(int, int);/**<age*/@property (nonatomic, assign) int age;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];#pragma mark - 作为参数    [self setupNav1:^{        NSLog(@"%s", __func__);    }];    [self setupNav2:^int{        return 3;    }];    [self setupNav3:^(int a, int b) {        NSLog(@"%d", a + b);    }];    [self setupNav4:^int(int a, int b) {        return a + b;    }];#pragma mark - 作为返回值调用    [self setupTab1]();    [self setupTab2]();    [self setupTab3](1, 3);    [self setupTab4](1, 3);}#pragma mark - blcok作为参数/** * 没有返回值,没有参数的block作为参数 */- (void)setupNav1:(void(^)())myBlock1{    myBlock1();}/** * 没有返回值,没有参数的block作为参数 */- (void)setupNav2:(int(^)())myBlock2{    myBlock2();}/** * 没有返回值,有参数的block作为参数 */- (void)setupNav3:(void(^)(int, int))myBlock3{    myBlock3(3, 5);}/** * 没有返回值,有参数的block作为参数 */- (void)setupNav4:(int(^)(int, int))myBlock4{    myBlock4(3, 5);}#pragma mark - blcok作为返回值/** * 没有返回值,没有参数的block作为返回值 */- (void(^)())setupTab1{    void(^block)() = ^{        NSLog(@"setupNav1");    };    return block;}/** * 有返回值,没有参数的block作为返回值 */- (int(^)())setupTab2{    int(^block)() = ^{        NSLog(@"setupNav1");        return 3;    };    return block;}/** * 没有返回值,有参数的block作为返回值 */- (void(^)(int, int))setupTab3{    void(^block)(int, int) = ^(int a, int b){        int c = a + b;        NSLog(@"%d", c);    };    return block;}/** * 有返回值,有参数的block作为返回值 */- (int(^)(int, int))setupTab4{    int(^block)(int, int) = ^(int a, int b){        int c = a + b;        NSLog(@"%d", c);        return c;    };    return block;}@end
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