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【移动应用开发技术】iOS如何实现当多个网络请求完成后执行下一步

前言解决方法1.首先，我们创建一个项目，然后做一般性的做法，不做任何处理去连续请求一个接口10次：//1.无处理

UIButton

*Btn1

=

[UIButton

buttonWithType:UIButtonTypeCustom];

Btn1.frame

=

CGRectMake(100,

100,

100,

40);

Btn1.backgroundColor

=

[UIColor

grayColor];

[Btn1

setTitle:@"noConduct"

forState:UIControlStateNormal];

[Btn1

addTarget:self

action:@selector(Btn1)

forControlEvents:UIControlEventTouchUpInside];

[self.view

addSubview:Btn1];//1.noConduct

-(void)Btn1{

NSString

*str

=

@"/p/6930f335adba";

NSURL

*url

=

[NSURL

URLWithString:str];

NSURLRequest

*request

=

[NSURLRequest

requestWithURL:url];

NSURLSession

*session

=

[NSURLSession

sharedSession];

for

(int

i=0;

i<10;

i++)

{

NSURLSessionDataTask

*task

=

[session

dataTaskWithRequest:request

completionHandler:^(NSData

*

_Nullable

data,

NSURLResponse

*

_Nullable

response,

NSError

*

_Nullable

error)

{

NSLog(@"%d%d",i,i);

}];

[task

resume];

}

NSLog(@"end");

}2017-12-04

17:10:10.503

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end

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55

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77

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66

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88

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992.使用GCD的dispatch_group_t//2.group

UIButton

*Btn2

=

[UIButton

buttonWithType:UIButtonTypeCustom];

Btn2.frame

=

CGRectMake(100,

200,

100,

40);

Btn2.backgroundColor

=

[UIColor

grayColor];

[Btn2

setTitle:@"group--"

forState:UIControlStateNormal];

[Btn2

addTarget:self

action:@selector(Btn2)

forControlEvents:UIControlEventTouchUpInside];

[self.view

addSubview:Btn2];//2.group--

-(void)Btn2{

NSString

*str

=

@"/p/6930f335adba";

NSURL

*url

=

[NSURL

URLWithString:str];

NSURLRequest

*request

=

[NSURLRequest

requestWithURL:url];

NSURLSession

*session

=

[NSURLSession

sharedSession];

dispatch_group_t

downloadGroup

=

dispatch_group_create();

for

(int

i=0;

i<10;

i++)

{

dispatch_group_enter(downloadGroup);

NSURLSessionDataTask

*task

=

[session

dataTaskWithRequest:request

completionHandler:^(NSData

*

_Nullable

data,

NSURLResponse

*

_Nullable

response,

NSError

*

_Nullable

error)

{

NSLog(@"%d%d",i,i);

dispatch_group_leave(downloadGroup);

}];

[task

resume];

}

dispatch_group_notify(downloadGroup,

dispatch_get_main_queue(),

^{

NSLog(@"end");

});

}2017-12-04

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00

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end2017-12-04

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00

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66

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99

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enddispatch_group_t

downloadGroup

=

dispatch_group_create();

dispatch_group_enter(downloadGroup);

dispatch_group_leave(downloadGroup);

dispatch_group_notify(downloadGroup,

dispatch_get_main_queue(),

^{

});3.使用GCD的信号量dispatch_semaphore_t//3.semaphore

UIButton

*Btn3

=

[UIButton

buttonWithType:UIButtonTypeCustom];

Btn3.frame

=

CGRectMake(100,

300,

100,

40);

Btn3.backgroundColor

=

[UIColor

grayColor];

[Btn3

setTitle:@"semaphore"

forState:UIControlStateNormal];

[Btn3

addTarget:self

action:@selector(Btn3)

forControlEvents:UIControlEventTouchUpInside];

[self.view

addSubview:Btn3];//3.semaphore--

-(void)Btn3{

NSString

*str

=

@"/p/6930f335adba";

NSURL

*url

=

[NSURL

URLWithString:str];

NSURLRequest

*request

=

[NSURLRequest

requestWithURL:url];

NSURLSession

*session

=

[NSURLSession

sharedSession];

dispatch_semaphore_t

sem

=

dispatch_semaphore_create(0);

for

(int

i=0;

i<10;

i++)

{

NSURLSessionDataTask

*task

=

[session

dataTaskWithRequest:request

completionHandler:^(NSData

*

_Nullable

data,

NSURLResponse

*

_Nullable

response,

NSError

*

_Nullable

error)

{

NSLog(@"%d%d",i,i);

count++;

if

(count==10)

{

dispatch_semaphore_signal(sem);

count

=

0;

}

}];

[task

resume];

}

dispatch_semaphore_wait(sem,

DISPATCH_TIME_FOREVER);

dispatch_async(dispatch_get_main_queue(),

^{

NSLog(@"end");

});

}2017-12-04

17:36:49.098

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00

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end2017-12-04

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00

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enddispatch_semaphore_t

sem

=

dispatch_semaphore_create(0);

dispatch_semaphore_signal(sem);

dispatch_semaphore_wait(sem,

DISPATCH_TIME_FOREVER);4.考虑新需求，10个网络请求顺序回调。//4.NSOperation

UIButton

*Btn4

=

[UIButton

buttonWithType:UIButtonTypeCustom];

Btn4.frame

=

CGRectMake(100,

400,

100,

40);

Btn4.backgroundColor

=

[UIColor

grayColor];

[Btn4

setTitle:@"NSOperation"

forState:UIControlStateNormal];

[Btn4

addTarget:self

action:@selector(Btn4)

forControlEvents:UIControlEventTouchUpInside];

[self.view

addSubview:Btn4];//4.NSOperation

-(void)Btn4{

NSString

*str

=

@"/p/6930f335adba";

NSURL

*url

=

[NSURL

URLWithString:str];

NSURLRequest

*request

=

[NSURLRequest

requestWithURL:url];

NSURLSession

*session

=

[NSURLSession

sharedSession];

NSMutableArray

*operationArr

=

[[NSMutableArray

alloc]init];

for

(int

i=0;

i<10;

i++)

{

NSBlockOperation

*operation

=

[NSBlockOperation

blockOperationWithBlock:^{

NSURLSessionDataTask

*task

=

[session

dataTaskWithRequest:request

completionHandler:^(NSData

*

_Nullable

data,

NSURLResponse

*

_Nullable

response,

NSError

*

_Nullable

error)

{

NSLog(@"%d%d",i,i);

}];

[task

resume];

//非网络请求

NSLog(@"noRequest-%d",i);

}];

[operationArr

addObject:operation];

if

(i>0)

{

NSBlockOperation

*operation1

=

operationArr[i-1];

NSBlockOperation

*operation2

=

operationArr[i];

[operation2

addDependency:operation1];

}

}

NSOperationQueue

*queue

=

[[NSOperationQueue

alloc]init];

[queue

addOperations:operationArr

waitUntilFinished:NO];

//YES会阻塞当前线程

#warning

-

绝对不要在应用主线程中等待一个Operation,只能在第二或次要线程中等待。阻塞主线程将导致应用无法响应用户事件,应用也将表现为无响应。

}2017-12-04

18:03:10.224

DownImage[3584:304363]

noRequest-0

2017-12-04

18:03:10.226

DownImage[3584:304362]

noRequest-1

2017-12-04

18:03:10.226

DownImage[3584:304363]

noRequest-2

2017-12-04

18:03:10.231

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noRequest-3

2017-12-04

18:03:10.232

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noRequest-4

2017-12-04

18:03:10.233

DownImage[3584:304362]

noRequest-5

2017-12-04

18:03:10.233

DownImage[3584:304363]

noRequest-6

2017-12-04

18:03:10.234

DownImage[3584:304363]

noRequest-7

2017-12-04

18:03:10.235

DownImage[3584:304363]

noRequest-8

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18:03:10.236

DownImage[3584:304363]

noRequest-9

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18:03:10.408

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22

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00

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99

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332017-12-04

18:04:27.699

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noRequest-0

2017-12-04

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noRequest-1

2017-12-04

18:04:27.701

DownImage[3584:306401]

noRequest-2

2017-12-04

18:04:27.701

DownImage[3584:306405]

noRequest-3

2017-12-04

18:04:27.702

DownImage[3584:306401]

noRequest-4

2017-12-04

18:04:27.702

DownImage[3584:306405]

noRequest-5

2017-12-04

18:04:27.703

DownImage[3584:306401]

noRequest-6

2017-12-04

18:04:27.703

DownImage[3584:306401]

noRequest-7

2017-12-04

18:04:27.704

DownImage[3584:306401]

noRequest-8

2017-12-04

18:04:27.704

DownImage[3584:306401]

noRequest-9

2017-12-04

18:04:27.772

DownImage[3584:306397]

22

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00

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88

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445.还是使用信号量semaphore完成4的需求//5.semaphoreorder

UIButton

*Btn5

=

[UIButton

buttonWithType:UIButtonTypeCustom];

Btn5.frame

=

CGRectMake(100,

500,

100,

40);

Btn5.backgroundColor

=

[UIColor

grayColor];

[Btn5

setTitle:@"order"

forState:UIControlStateNormal];

[Btn5

addTarget:self

action:@selector(Btn5)

forControlEvents:UIControlEventTouchUpInside];

[self.view

addSubview:Btn5];//5.semaphore--order

-(void)Btn5{

NSString

*str

=

@"/p/6930f335adba";

NSURL

*url

=

[NSURL

URLWithString:str];

NSURLRequest

*request

=

[NSURLRequest

requestWithURL:url];

NSURLSession

*session

=

[NSURLSession

sharedSession];

dispatch_semaphore_t

sem

=

dispatch_semaphore_create(0);

for

(int

i=0;

i<10;

i++)

{

NSURLSessionDataTask

*task

=

[session

dataTaskWithRequest:request

completionHandler:^(NSData

*

_Nullable

data,

NSURLResponse

*

_Nullable

response,

NSError

*

_Nullable

error)

{

NSLog(@"%d%d",i,i);

dispatch_semaphore_signal(sem);

}];

[task

resume];

dispatch_semaphore_wait(sem,

DISPATCH_TIME_FOREVER);

}

dispatch_async(dispatch_get_main_queue(),

^{

NSLog(@"end");

});

}2017-12-05

10:17:28.175

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88

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99

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10:17:29.653

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end2017-12-05

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5

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