Is Fast Enumeration messing with my text output?
- by Dan Ray
Here I am iterating through an array of NSDictionary objects (inside the parsed JSON response of the EXCELLENT MapQuest directions API). I want to build up an HTML string to put into a UIWebView.
My code says:
for (NSDictionary *leg in legs ) {
NSString *thisLeg = [NSString stringWithFormat:@"<br>%@ - %@", [leg valueForKey:@"narrative"], [leg valueForKey:@"distance"]];
NSLog(@"This leg's string is %@", thisLeg);
[directionsOutput appendString:thisLeg];
}
The content of directionsOutput (which is an NSMutableString) contains ALL the values for [leg valueForKey:@"narrative"], wrapped up in parens, followed by a hyphen, followed by all the parenthesized values for [leg valueForKey:@"distance"]. So I put in that NSLog call... and I get the same thing there! It appears that the for() is somehow batching up our output values as we iterate, and putting out the output only once.
How do I make it not do this but instead do what I actually want, which is an iterative output as I iterate?
Here's what NSLog gets. Yes, I know I need to figure out NSNumberFormatter. ;-)
This leg's string is (
"Start out going NORTH on INFINITE LOOP.",
"Turn LEFT to stay on INFINITE LOOP.",
"Turn RIGHT onto N DE ANZA BLVD.",
"Merge onto I-280 S toward SAN JOSE.",
"Merge onto CA-87 S via EXIT 3A.",
"Take the exit on the LEFT.",
"Merge onto CA-85 S via EXIT 1A on the LEFT toward GILROY.",
"Merge onto US-101 S via EXIT 1A on the LEFT toward LOS ANGELES.",
"Take the CA-152 E/10TH ST exit, EXIT 356.",
"Turn LEFT onto CA-152/E 10TH ST/PACHECO PASS HWY. Continue to follow CA-152/PACHECO PASS HWY.",
"Turn SLIGHT RIGHT.",
"Turn SLIGHT RIGHT onto PACHECO PASS HWY/CA-152 E. Continue to follow CA-152 E.",
"Merge onto I-5 S toward LOS ANGELES.",
"Take the CA-46 exit, EXIT 278, toward LOST HILLS/WASCO.",
"Turn LEFT onto CA-46/PASO ROBLES HWY. Continue to follow CA-46.",
"Merge onto CA-99 S toward BAKERSFIELD.",
"Merge onto CA-58 E via EXIT 24 toward TEHACHAPI/MOJAVE.",
"Merge onto I-15 N via the exit on the LEFT toward I-40/LAS VEGAS.",
"Keep RIGHT to take I-40 E via EXIT 140A toward NEEDLES (Passing through ARIZONA, NEW MEXICO, TEXAS, OKLAHOMA, and ARKANSAS, then crossing into TENNESSEE).",
"Merge onto I-40 E via EXIT 12C on the LEFT toward NASHVILLE (Crossing into NORTH CAROLINA).",
"Merge onto I-40 BR E/US-421 S via EXIT 188 on the LEFT toward WINSTON-SALEM.",
"Take the CLOVERDALE AVE exit, EXIT 4.",
"Turn LEFT onto CLOVERDALE AVE SW.",
"Turn SLIGHT LEFT onto N HAWTHORNE RD.",
"Turn RIGHT onto W NORTHWEST BLVD.",
"1047 W NORTHWEST BLVD is on the LEFT."
) - (
0.0020000000949949026,
0.07800000160932541,
0.14000000059604645,
7.827000141143799,
5.0329999923706055,
0.15299999713897705,
5.050000190734863,
20.871000289916992,
0.3050000071525574,
2.802999973297119,
0.10199999809265137,
37.78000259399414,
124.50700378417969,
0.3970000147819519,
25.264001846313477,
20.475000381469727,
125.8580093383789,
4.538000106811523,
1693.0350341796875,
628.8970336914062,
3.7990000247955322,
0.19099999964237213,
0.4099999964237213,
0.257999986410141,
0.5170000195503235,
0
)
