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//
// main.m
// 2-7 LessonBlock
//
// Created by lanouhn on 15/3/9.
// Copyright (c) 2015年 lanouhn. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "Student.h"
#import "LoginManager.h"
//函数声明
int maxValue(int a, int b);
//函数定义
int maxValue(int a, int b) {
return a > b ? a : b;
}
//函数指针类型
//int (*)(int, int)
//函数指针变量
int (*p)(int, int) = NULL;
//函数指针类型冲命名
typedef int (*Type)(int, int);
//函数指针变量
Type p1 = NULL;
int main(int argc, const char * argv[]) {
@autoreleasepool {
//函数调用
int max = maxValue(1, 2);
printf("%d\n", max);
//函数指针指向函数首地址
p =maxValue;
//如果函数指针指向了函数的首地址, 这个指针就可以用来调用函数
max = p(1, 2);
printf("%d\n", max);
//Block
//Block的类型
//返回值类型 (^)(参数类型1 参数名1, 参数类型2 参数名2, ...)
//注:1.如果没有参数, 括号不能省略
// 2.参数名一般省略, 特殊工艺情况为了使用方便, 参数名不省略
//int (^)(int, int)
//Block的定义
//注:block的名字写在^后面
int (^blockName)(int, int);
//Block赋值(block的实现)
//^(参数类型 参数名1, 参数类型2 参数名2, ...) {
// 执行代码
//}
//注:1.参数名不能省略
// 2.如果block有返回值,用return返回
blockName = ^(int a, int b) {
return a + b;
};
int (^blockName1)(int, int) = ^(int a, int b) {
return a + b;
};
//Block的调用
//block名(实参1, 实参2, ...)
int sum = blockName(1, 2);
NSLog(@"%d", sum);
NSLog(@"%d", blockName1(4, 5));
//写一个block, 用于实现答应Hello World;
void (^hello)();
hello = ^() {
NSLog(@"Hello World");
};
hello();
//typedef重命名block类型
typedef void (^BlockType)();
BlockType hello1 = ^() {
NSLog(@"Hello World");
};
hello1();
//写一个block, 用于实现打印Hello + 人名
void (^hello2)(NSString *str);
hello2 = ^(NSString *str) {
NSLog(@"hello %@", str);
};
hello2(@"xiaoming");
//写一个返回值为整型 参数为OC字符串 (仅一个参数)的block, 实现将字符串转换为整型的功能
int (^change)(NSString *str1) = ^(NSString *str1) {
return [str1 intValue];
};
NSString *string = @"2125";
NSLog(@"%d", change(string));
//block中变量的使用
//1.block内部不能够访问局部变量, 需要加修饰词__block, __weak
//2.block内部可以访问全局变量
//3.ARC模式下用__weak, 基本数据类型用__block
//4.MRC模式下全部用__block
__block int number = 100;
//block, 每次执行block, 修改number的值,并打印
void (^addNumber)() = ^() {
number = number +1;
NSLog(@"%d", number);
};
addNumber();
//block与数组排序
NSMutableArray *array = [[NSMutableArray alloc] initWithObjects:@"1023", @"562", @"485", @"785", @"111", nil];
//按字符串顺序排序
NSArray *sortArray1 = [array sortedArrayUsingSelector:@selector(compare:)];
NSLog(@"%@", sortArray1);
//NSOrderedDescending
//NSOrderedSame
//NSOrderedAscending
NSArray *sortArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
//升序排序
if ([obj1 intValue] > [obj2 intValue]) {
return NSOrderedDescending; //前一个大
} else if([obj1 intValue] < [obj2 intValue]) {
return NSOrderedAscending;//后一个大
} else {
return NSOrderedSame;
}
}];
NSLog(@"%@", sortArray);
//用block对数组进行降序排序
NSArray *array1 = @[@1.2, @45.6, @45.0, @22.1, @7.10];
NSArray *sortArray3 = [array1 sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
if ([obj1 floatValue] > [obj2 floatValue]) {
return NSOrderedDescending;
} else if ([obj1 floatValue] < [obj2 floatValue]) {
return NSOrderedAscending;
} else {
return NSOrderedSame;
}
}];
NSLog(@"%@", sortArray3);
Student *stu1 = [[Student alloc] initWithName:@"zijian" score:88.5];
Student *stu2 = [[Student alloc] initWithName:@"junfei" score:99.0];
Student *stu3 = [[Student alloc] initWithName:@"chengzhen" score:100.0];
Student *stu4 = [[Student alloc] initWithName:@"gaoshang" score:80.0];
//学生以姓名排序a - z
NSMutableArray *mArray = [[NSMutableArray alloc] initWithCapacity:0];
[mArray addObject:stu1];
[mArray addObject:stu2];
[mArray addObject:stu3];
[mArray addObject:stu4];
NSArray *sortArray4 = [mArray sortedArrayUsingComparator:^NSComparisonResult(Student *obj1, Student *obj2) {
// return [obj1.name compare:obj2.name];
if ([obj1.name compare:obj2.name] == 1) {
return NSOrderedDescending;
} else if ([obj1.name compare:obj2.name] == -1) {
return NSOrderedAscending;
} else {
return NSOrderedSame;
}
}];
NSLog(@"%@", sortArray4);
//学生以分数由高到低排序
NSArray *sortArray5 = [mArray sortedArrayUsingComparator:^NSComparisonResult(Student *obj1, Student *obj2) {
if (obj1.score > obj2.score) {
return NSOrderedDescending;
} else if (obj1.score < obj2.score) {
return NSOrderedAscending;
} else {
return NSOrderedSame;
}
}];
NSLog(@"%@", sortArray5);
//
LoginManager *loginManager = [[LoginManager alloc] init];
loginManager.account = @"Kris";
loginManager.passWord = @"88888888";
[loginManager login];
// [loginManager loginWithSuccess:^(LoginManager *loginManager){
// NSLog(@"我很高兴!");
// } failure:^(LoginManager *loginManager){
// NSLog(@"我不高兴!");
// }];
//
[loginManager loginWithSuccess:^(LoginManager *loginManager){
NSLog(@"%@",loginManager.account);
} failure:^(LoginManager *loginManager){
NSLog(@"%@", loginManager.passWord);
}];
//字面量, 语法糖
NSString *string5 = @"ios";
NSNumber *number1 = @100;
NSArray *array7 = @[@"123", @"abc"];
[array7 objectAtIndex:0];
NSLog(@"%@", array7[1]);
NSDictionary *dic = @{@"name": @"zhangsan", @"age": @12};
NSLog(@"%@", dic[@"name"]);
}
return 0;
}
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原文地址：http://www.cnblogs.com/xiaoxuetongxie/p/4328287.html
