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如何檢查NSMutableArray中的對象是否爲零而不會出現錯誤index .. beyond bounds for empty array
?我收到的錯誤使用下面的代碼:檢查objectAtIndex是否爲零而沒有收到錯誤?
if (![self.sortedArray objectAtIndex:[alphabet indexOfObject:[NSString stringWithFormat:@"%c", (char) [letter characterAtIndex:0]]]]) {
NSMutableArray *arr = [NSMutableArray arrayWithObject:countryDict];
[self.sortedArray addObject:arr];
}
else {
[[self.sortedArray objectAtIndex:[alphabet indexOfObject:[NSString stringWithFormat:@"%c", (char) [letter characterAtIndex:0]]]] addObject:countryDict];
}