ios Objective-C 中的字符串替换
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String replacement in Objective-C
提问by 4thSpace
How to replace a character is a string in Objective-C?
如何在Objective-C中替换一个字符是一个字符串？
回答by epatel
You could use the method
你可以用这个方法
- (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target
withString:(NSString *)replacement
...to get a new string with a substring replaced (See NSStringdocumentation for others)
...获取替换了子字符串的新字符串（请参阅NSString其他文档）
Example use
示例使用
NSString *str = @"This is a string";
str = [str stringByReplacingOccurrencesOfString:@"string"
withString:@"duck"];
回答by mipadi
NSStringobjects are immutable (they can't be changed), but there is a mutable subclass, NSMutableString, that gives you several methods for replacing characters within a string. It's probably your best bet.
NSString对象是不可变的（它们不能更改），但是有一个可变子类NSMutableString，它为您提供了几种替换字符串中字符的方法。这可能是你最好的选择。
回答by tania_S
If you want multiple string replacement:
如果您想要多个字符串替换：
NSString *s = @"foo/bar:baz.foo";
NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"/:."];
s = [[s componentsSeparatedByCharactersInSet: doNotWant] componentsJoinedByString: @""];
NSLog(@"%@", s); // => foobarbazfoo
回答by Marlon Ruiz
It also posible string replacement with stringByReplacingCharactersInRange:withString:
它还可以用 stringByReplacingCharactersInRange:withString 替换字符串：
for (int i = 0; i < card.length - 4; i++) {
if (![[card substringWithRange:NSMakeRange(i, 1)] isEqual:@" "]) {
NSRange range = NSMakeRange(i, 1);
card = [card stringByReplacingCharactersInRange:range withString:@"*"];
}
} //out: **** **** **** 1234
回答by Shaik Tamim
NSString *stringreplace=[yourString stringByReplacingOccurrencesOfString:@"search" withString:@"new_string"];
回答by Meir
The problem exists in old versions on the iOS. in the latest, the right-to-left works well. What I did, is as follows:
iOS 上的旧版本存在此问题。最近，从右到左的效果很好。我所做的如下：
first I check the iOS version:
首先我检查iOS版本：
if (![self compareCurVersionTo:4 minor:3 point:0])
Than:
比：
// set RTL on the start on each line (except the first)
myUITextView.text = [myUITextView.text stringByReplacingOccurrencesOfString:@"\n"
withString:@"\u202B\n"];
