最近因项目需求，需要用到强制更新功能，网上搜了一下，挺多的，但是把网上的代码拷贝以后，发现一个bug，就是进app，弹出框显示，点击现在升级，跳转到appstore下载里面，但是我不下载，又切回到app里面，发现弹出框就不跳了，其实也简单，就是appdelegate里面有个代理方法，就是当app从后台切到前台走的方法，将强制更新方法在这里面在调用一下就行了~~~话不多说，上代码！！！用的话直接粘贴复制~
效果图:
在appdelegate里面写下面代码
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//提示版本更新
[self versonupdate];
#pragma mark ------提示用户版本更新------
-(void)versonupdate{
//定义app地址
nsstring *urld = [nsstring stringwithformat:@"http://itunes.apple.com/lookup?id=%d",1178114725];
nsurl *url = [nsurl urlwithstring:urld];
nsmutableurlrequest *request = [nsmutableurlrequest requestwithurl:url cachepolicy:nsurlrequestreloadignoringcachedata timeoutinterval:10];
[request sethttpmethod:@"post"];
nsurlsession *session = [nsurlsession sharedsession];
nsurlsessiondatatask *task = [session datataskwithurl:url completionhandler:^(nsdata * _nullable data, nsurlresponse * _nullable response, nserror * _nullable error) {
nslog(@"%@",response);
nsmutabledictionary *receivestatusdic = [[nsmutabledictionary alloc]init];
if (data) {
nsdictionary *receivedic = [nsjsonserialization jsonobjectwithdata:data options:nsjsonreadingmutableleaves error:nil];
if ([[receivedic valueforkey:@"resultcount"] intvalue] > 0) {
[receivestatusdic setobject:@"1" forkey:@"status"];
[receivestatusdic setobject:[[[receivedic valueforkey:@"results"] objectatindex:0] valueforkey:@"version"] forkey:@"version"];
[self performselectoronmainthread:@selector(receivedata:) withobject:receivestatusdic waituntildone:no];
}else{
[receivestatusdic setvalue:@"1" forkey:@"status"];
}
}else{
[receivestatusdic setvalue:@"-1" forkey:@"status"];
}
}];
[task resume];
}
-(void)receivedata:(id)sender
{
//获取app自身版本号
nsstring *localversion = [[[nsbundle mainbundle]infodictionary]objectforkey:@"cfbundleshortversionstring"];
nsarray *localarray = [localversion componentsseparatedbystring:@"."];//1.0
nsarray *versionarray = [sender[@"version"] componentsseparatedbystring:@"."];//3 2.1.1
// if ((versionarray.count == 2) && (localarray.count == versionarray.count)) {
if ([localarray[0] intvalue] < [versionarray[0] intvalue]) {
[self updateversion];
}else if ([localarray[0] intvalue] == [versionarray[0] intvalue]){
if ([localarray[1] intvalue] < [versionarray[1] intvalue]) {
[self updateversion];
}else if ([localarray[1] intvalue] == [versionarray[1] intvalue]){
if ([localarray[2] intvalue] < [versionarray[2] intvalue]) {
[self updateversion];
}
}
}
// }
}
-(void)updateversion{
nsstring *msg = [nsstring stringwithformat:@"版本过低，需要升级到最新版本"];
uialertcontroller *alertcontroller = [uialertcontroller alertcontrollerwithtitle:@"升级提示" message:msg preferredstyle:uialertcontrollerstylealert];
uialertaction *otheraction = [uialertaction actionwithtitle:@"现在升级" style:uialertactionstyledestructive handler:^(uialertaction*action) {
nsurl *url = [nsurl urlwithstring:[nsstring stringwithformat:@"https://itunes.apple.com/cn/app/m-help/id1178114725?mt=8"]];
[[uiapplication sharedapplication]openurl:url];
}];
[alertcontroller addaction:otheraction];
[self.window.rootviewcontroller presentviewcontroller:alertcontroller animated:yes completion:nil];
}
//当app从后台切到前台时调用的方法
- (void)applicationdidbecomeactive:(uiapplication * )application
{
[self versonupdate];
}
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.jianshu.com/p/700505ce2643?utm_source=tuicool&utm_medium=referral#