我有一个NSArray,它的各个部分都被,。
这个数组要长得多
citiesArray10000 = [NSArray arrayWithObjects:
@"33.572162&-112.087966&Phoenix&Arizona",
@"32.154289&-110.871062&735&Tucson Arizona ",
@"33.401926&-111.717379&Mesa&Arizona",
@"33.282874&-111.854943&Chandler&Arizona",
nil];
我遍历它们以查看它们是否满足特定的条件。
[citiesArray10000 enumerateObjectsUsingBlock:^(id object, NSUInteger idx, BOOL *stop) {
// do something with object
NSArray *coorArray = [object componentsSeparatedByString:@"&"];
NSString *firstString = [coorArray objectAtIndex:0];
NSString *secondString = [coorArray objectAtIndex:1];
NSString *thirdString = [coorArray objectAtIndex:2];
NSString *fourthString = [coorArray objectAtIndex:3];
if (fabs(crnLoc.coordinate.latitude - latitude) <= 1) {
if (abs(crnLoc.coordinate.longitude - longitude <= 1)) {
self.label.text = fourthString;
}
}
标签将根据满足条件的对象的坐标浮动在屏幕表面上
self.label.frame = CGRectMake(160,(((self.mheading-90)-β)*-5.688)+200, 30, 200);
self.label2.frame = CGRectMake(160,(((self.mheading-90)-β)*-5.688)+200, 30, 200);
其中β根据坐标的不同具有不同的值。
问题是,如果数组中有多个对象满足条件,我需要创建另一个标签,并将其文本作为该对象的fourthString。然后,当不再满足该条件时,删除该标签。有没有办法做到这一点?
发布于 2019-01-09 13:07:47
使用tag怎么样?当您迭代citiesArray10000数组时,我认为您可以向uilabel添加一个标签,然后,当条件不再满足时,您可以通过标签找到标签并删除标签。
[citiesArray10000 enumerateObjectsUsingBlock:^(id object, NSUInteger idx, BOOL *stop) {
// do something with object
NSArray *coorArray = [object componentsSeparatedByString:@"&"];
NSString *firstString = [coorArray objectAtIndex:0];
NSString *secondString = [coorArray objectAtIndex:1];
NSString *thirdString = [coorArray objectAtIndex:2];
NSString *fourthString = [coorArray objectAtIndex:3];
if (fabs(crnLoc.coordinate.latitude - latitude) <= 1) {
if (abs(crnLoc.coordinate.longitude - longitude <= 1)) {
UILabel *label = (UILabel *)[self.view viewWithTag:idx];
label.text = fourthString;
// add the label to the view ...
}
}
}
https://stackoverflow.com/questions/54079830
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