Objective C 只读 int？什么？
我做了一个整数来计算我的一个流程有多少成功。在我的代码之外，我声明：
int successes = 0。
然后在我的循环中，我有 successes++;，此时 XCode 抱怨“变量不可分配（缺少 _block 类型说明符）”。
到底是怎么回事？为什么我不能增加我的 int 值？我从未声明它是只读的...
非常感谢任何帮助。
我使用的代码是：
_block int successes = 0;
for(CLLocation *location in locationOutputArray)
{
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error)
{
if(placemarks && placemarks.count > 0)
{
successes++;
CLPlacemark *topResult = [placemarks objectAtIndex:0];
NSString *address = [NSString stringWithFormat:@"%@ %@,%@ %@", [topResult subThoroughfare],[topResult thoroughfare],[topResult locality], [topResult administrativeArea]];
[addressOutputArray addObject:address];
NSLog(@"%@",address);
}
}];
[geocoder release];
}
I made an int to count how many successes one of my processes has. Outside my code, I declare:
int successes = 0.
Then within my loop, I have successes++;, at which point XCode complains that "variable is not assignable (missing _block type specifier)".
What is going on? Why can't I increment my int? I never declared it read-only...
Any help is much appreciated.
The code I used is:
_block int successes = 0;
for(CLLocation *location in locationOutputArray)
{
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error)
{
if(placemarks && placemarks.count > 0)
{
successes++;
CLPlacemark *topResult = [placemarks objectAtIndex:0];
NSString *address = [NSString stringWithFormat:@"%@ %@,%@ %@", [topResult subThoroughfare],[topResult thoroughfare],[topResult locality], [topResult administrativeArea]];
[addressOutputArray addObject:address];
NSLog(@"%@",address);
}
}];
[geocoder release];
}
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您的循环位于块内（
^{...}语法）。如果变量没有__block说明符，则块无法更改块外部的变量。Your loop is inside a block (
^{...}syntax). Blocks cannot alter variables outside of the block without that variable having a__blockspecifier.您尝试在块内访问此
int。将其标记为__block，以便可以从块内更新它。块编程主题
You tried accessing this
intinside a block. Mark it as__blockso it can be updated from within the block.Blocks Programming Topics