[英]How to reuse obj-c block?
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
[manager GET:@"http://aaa"
success:^(AFHTTPRequestOperation *operation, id responseJSON) {
...
}
failure:^(AFHTTPRequestOperation *operation, NSError *error) {
[[TWMessageBarManager sharedInstance]
showMessageWithTitle:@"Network connection failure"
description:@"Please check your network"
type:TWMessageBarMessageTypeError];
}];
有些塊是常數,可以重復使用。 例如,這里的故障塊,如何重用此塊以減少代碼量?
我希望它是全局重用,而不是當前上下文,因此我可以將其存儲為屬性嗎? 還是get_method()?
您可以像這樣保存變量:
void(^blockname)(AFHTTPRequestOperation*, NSError*) = ^(AFHTTPRequestOperation *operation, NSError *error) {
[[TWMessageBarManager sharedInstance]
showMessageWithTitle:@"Network connection failure"
description:@"Please check your network"
type:TWMessageBarMessageTypeError];
}
然后只是把blockname
失敗參數,而不是整個事情
將塊保存到變量,然后可以將其傳遞:
void (^failureBlock)(AFHTTPRequestOperation *operation, NSError *error) = ^void(AFHTTPRequestOperation *operation, NSError *error) { /* write what you want */ };
void (^successBlock)(AFHTTPRequestOperation *operation, id responseJSON) = ^void(AFHTTPRequestOperation *operation, id responseJSON) { /* write what you want */ };
然后,您可以在進一步的調用中使用它,例如:
[manager GET:@"" success:successBlock failure: failureBlock];
獎勵: 查看本指南 。
另一種方法,而不是重用塊,應該考慮重用整個函數
- (void)getURLPath:(NSString *)urlPath withSuccessBlock:(void (^)(id responseJSON))block {
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
[manager GET:urlPath
success:^(AFHTTPRequestOperation *operation, id responseJSON) {
...
}
failure:^(AFHTTPRequestOperation *operation, NSError *error) {
[[TWMessageBarManager sharedInstance]
showMessageWithTitle:@"Network connection failure"
description:@"Please check your network"
type:TWMessageBarMessageTypeError];
}];
}
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