@interface URLClass : NSObject
{
id target;
SEL funObj;
}
+ (URLClass *)sharedInstance;
-(void)theBigFunction:(SEL)func :(id)target;
@property (nonatomic,retain) SEL funObj;
#import "URLClass.h"
static URLClass *instance = NULL;
@implementation URLClass
{
NSMutableData *webData;
}
- (id)init
{
if ( self = [super init] )
{
}
return self;
}
+ (URLClass *)sharedInstance
{
@synchronized([URLClass class])
{
if (!instance)
instance = [[super alloc] init];
return instance;
}
return nil;
}
-(void)theBigFunction:(SEL)func :(id)targetObj{
funObj =func;
target=targetObj;
NSURL *URL = [NSURL URLWithString:@"urlString"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
if( connection )
{
webData = [NSMutableData data] ;
}
else
{
NSLog(@"theConnection is NULL");
}
}
-(BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace
{
return YES;
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[webData setLength: 0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[webData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"ERROR with theConenction");
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSError *error;
id jsonObj = [NSJSONSerialization JSONObjectWithData:webData options:0 error:&error];
if (jsonObj!=nil && error==nil) {
if ([jsonObj isKindOfClass:[NSDictionary class]]) {
NSDictionary *dic=(NSDictionary*)jsonObj;
NSLog(@"DIC jsonObj %@ ",dic);
NSArray *array=[dic objectForKey:@"items"];
NSLog(@"array jsonObj %@ %d",array,[array count]);
}else if ([jsonObj isKindOfClass:[NSArray class]]) {
NSArray *arr=(NSArray*)jsonObj;
NSLog(@"arr jsonObj %@ ",arr);
}
}
[target performSelector:funObj];
// Not gEtting called the aboue line
// performSelector可能会导致泄漏,因为它的选择器在上一行中是未知警告}
当计划执行以下行时,可使用任何类的表单代码。它不会被调用。
-(void)loginPress:(id)sender{
URLClass *rlOBJ=[URLClass sharedInstance];
[rlOBJ theBigFunction:@selector(upd_Handler:) :self];
}
- (void) upd_Handler: (id) value{
NSLog( @"Seccess");
}
那是警告,不是错误。您的代码应该仍然有效。
当您调用选择器而编译器无法确定选择器是什么时,它无法分辨所调用的方法是否要获取传递的对象的所有权,是否释放它或释放它。因此,ARC无法确定是否正确处理了该参数的内存管理。
您应该能够将performSelector调用包含在编译器指令中以禁用该警告。这样,您就要负担确保所调用的方法不保留对传递给它的对象的任何强引用,也不要释放该对象。
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