ios - performSelectorInBackground 上的 EXC_BAD_ACCESS

Question

我想在后台调用这个方法，

-(void)downloadImage_3:(NSString* )Path AtIndex:(int)i

我以这种方式调用，但它崩溃并显示 EXC_BAD_ACCESS

[self performSelectorInBackground:@selector(downloadImage_3:AtIndex:) withObject:[NSArray arrayWithObjects:@"http://www.google.com",i, nil]];

如何在后台调用downloadImage_3:方法？

我哪里做错了？

Answer 1

试试这个

[self performSelectorInBackground:@selector(downloadImage_3:AtIndex:) withObject:[NSArray arrayWithObjects:@"http://www.google.com",i, nil]  afterDelay:15.0];

或者试试这个

NSString* number    =   [NSString stringWithFormat:@"%d",i];
NSArray* arrayValues    =   [[NSArray alloc] initWithObjects:[[msg_array objectAtIndex:i] valueForKey:@"Merchant_SmallImage"],number, nil];
NSArray* arrayKeys      =   [[NSArray alloc] initWithObjects:@"Path",@"Index",nil];
NSDictionary* dic   =   [[NSDictionary alloc] initWithObjects:arrayValues forKeys:arrayKeys];
[self performSelectorInBackground:@selector(downloadImage_3:) withObject:dic];

像这样定义 downloadImage_3 函数:

-(void)downloadImage_3:(NSDictionary *)dic 
{
   NSString *path = [dic valueForKey:@"Path"];
int i     = [[dic valueForKey:@"Index"] intValue];
  //Your code
}