[iOS] 包含字串 (Contains String)
程式語言會隨著時間進化。本次專案依然會處理字串，我自己定義字串來區別用途，想知道是否包含字串 (Contains String)，iOS 7以前的作法很拐彎抹角，我是查詢StackOverflow才知道，而且不是查詢一次就記起來，可見這支NSString的method有多不直覺！
iOS 8以後，就可以用「包含」這個方法：
containsString
我很自然地就使用它，在iPhone 6/6+跑都沒問題，因為一買來就是iOS 8。直到夥伴大鳥跟我說，用它iPhone 5一跑就崩潰，後來得知它手機還是iOS 7，就在想是那支method有問題。答案揭曉⋯⋯
/**
Theme: Contains String
IDE: Xcode 6
Language: Objective C
Date: 104/03/31
Author: HappyMan
Blog: https://cg2010studio.wordpress.com/
*/
/* containsString: returns YES if the target string is contained within the receiver. Same as calling rangeOfString:options: with no options, thus doing a case-sensitive, non-literal search. localizedCaseInsensitiveContainsString: is the case-insensitive variant. Note that it takes the current locale into effect as well. Locale-independent case-insensitive operation, and other needs can be achieved by calling rangeOfString:options:range:locale: directly.
*/
- (BOOL)containsString:(NSString *)aString NS_AVAILABLE(10_10, 8_0);
//--
/* These methods return length==0 if the target string is not found. So, to check for containment: ([str rangeOfString:@"target"].length > 0). Note that the length of the range returned by these methods might be different than the length of the target string, due composed characters and such.
*/
- (NSRange)rangeOfString:(NSString *)aString;
//--
NSString *str;
if ([str rangeOfString:@"HappyDay"].location != NSNotFound) {
// iOS 7以前拐彎抹角
}
if ([str containsString:@"HappyDay"]) {
// iOS 8以後可以很開心
}
把method的名稱設計得很直覺，真的是件好事呀～
參考：。
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