-(void)method1
{
[self method2];
[self method3]; //After finishing execution of method2 and its delegates I want to execute method3
}
此处,方法 2 在调用时开始运行,但在执行其委托(delegate)方法之前,方法 3 开始执行。如何避免这种情况?任何建议或代码请
我在方法 2
中调用了一个与其委托(delegate)的 nsurl 连接 -(void)method2
{
....
connection= [[NSURLConnection alloc] initWithRequest:req delegate:self ];
....
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
}
-(void) connection:(NSURLConnection *) connection didReceiveData:(NSData *) data
{
}
..
..
最佳答案
使用 block - 会更容易处理:
[NSURLConnection sendAsynchronousRequest:request
queue:[[NSOperationQueue alloc] init]
completionHandler:^(NSURLResponse *response,
NSData *data,
NSError *error)
{
if ([data length] >0 && error == nil) {
// parse your data here
[self method3];
dispatch_async(dispatch_get_main_queue(), ^{
// call method on main thread, which can be used to update UI stuffs
[self updateUIOnMainThread];
});
}
else if (error != nil) {
// show an error
}
}];
关于ios - 等到委托(delegate)方法在 ios 中完成执行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18459161/