iphone - if else 语句混淆 Objective-C

Question

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Answer 1

你不需要 if-else。你可以做这样的事情。

NSString* string = @"ABCDEFG12345";

int foundA = [string rangeOfString:@"A"].location == NSNotFound ? 0 : 1;
int found1 = [string rangeOfString:@"1"].location == NSNotFound ? 0 : 1;
int found5 = [string rangeOfString:@"5"].location == NSNotFound ? 0 : 1;

int foundCount = foundA + found1 + found5;

switch(foundCount) {
    case 1: [self executeOne]; break;
    case 2: [self executeTwo]; break;
    case 3: [self executeThree]; break;
}