iOS字符串的操作比較重要也比較多,終於收集全力了,趕緊收藏吧
<span style="background-color: rgb(192, 192, 192);"><span style="font-size:24px;">#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
@autoreleasepool {
/**
* 字符串的多種創建方式
*/
//1、快速創建
NSString* str1 = @"這是第一個字符串";
NSInteger len = [str1 length];
NSLog(@"%@",str1);
NSLog(@"字符串的長度為:%ld",len);
//2、alloc創建字符串,累贅,已不建議使用
//NSString* str2 = [[NSString alloc]initWithString:@"alloc創建的字符串"];
//NSLog(@"%@",str2);
//3、格式化符創建
NSString* str3 = [[NSString alloc]initWithFormat:@"格式化創建,上一句是%@",str1];
NSLog(@"%@",str3);
//4、格式化符創建方式二
int a = 10;
NSString* str4 = [NSString stringWithFormat:@"類方法創建,%d",a];
NSLog(@"%@",str4);
/**
* 比較字符串
*/
NSString* s1 = [NSString stringWithFormat:@"ksjflkjdlf"];
NSString* s2 = [NSString stringWithFormat:@"ksjflkjdlf"];
if (![s1 compare:s2]) {
NSLog(@"兩個字符串相等");
}
if (s1 == s2) {
NSLog(@"這是比較兩個字符串指針地址");
}
if ([s1 isEqualToString:s2]){
NSLog(@"兩個字符串相等");
}
// s1 caseInsensitiveCompare:s2爲忽略大小寫比較
if ([s1 caseInsensitiveCompare:s2] == NSOrderedAscending){
NSLog(@"升序,s2 > s1");
}else if ([s1 caseInsensitiveCompare:s2] == NSOrderedSame){
NSLog(@"升序,s1 = s2");
}else if ([s1 caseInsensitiveCompare:s2] == NSOrderedDescending){
NSLog(@"降序,s1 > s2");
}
/**
* 轉換字符串
*/
NSString * string1 = @"Welcome to BeiJing";
NSLog(@"%@",[string1 uppercaseString]); //將字符串全部大寫
NSLog(@"%@",[string1 lowercaseString]); //將字符串全部小寫
NSLog(@"%@",[string1 capitalizedString]); //將字符串首字母大寫,其餘變小寫
NSString *string2 = @"37498";
NSLog(@"將字符串轉換為整型:%ld",[string2 integerValue]);
NSString *string3 = @"37.498";
NSLog(@"將字符串轉換為浮點型:%f",[string3 floatValue]);
NSString *string4 = @"1";
NSLog(@"將字符串轉換為布尓型:%d",[string4 boolValue]);
/**
* 截取字符串
*/
NSString *charString1 = @"abcdefg,sdjfk,ncnv,dkjf";
//以逗號為分割符分割字符串存儲於數組中
NSArray *array = [charString1 componentsSeparatedByString:@","];
NSLog(@"%@",array);
//訪問指定位置字符
char s = [charString1 characterAtIndex:4];
NSLog(@"%c",s);
//截取位置前面的字符串,不包括指定位置的字符
NSString * subString1 = [charString1 substringToIndex:5];
NSLog(@"%@",subString1);
//截取位置後面的字符串,包括指定位置字符
NSString * subString2 = [charString1 substringFromIndex:15];
NSLog(@"%@",subString2);
//截取位置3之後的9個字符串
NSRange rang = NSMakeRange(3, 9);
NSString * subString3 = [charString1 substringWithRange:rang];
NSLog(@"%@",subString3);
/**
* 拼接字符串
*/
NSString *monString = [subString1 stringByAppendingString:subString2];
NSLog(@"%@",monString);
//追加字符串,類似字符串拼接
NSString *monString1 = [subString2 stringByAppendingFormat:@"%@",subString3];
NSLog(@"%@",monString1);
/**
* 查找字符串
*/
NSRange r = [charString1 rangeOfString:subString1];
if (r.location != NSNotFound) {
NSLog(@"%@中包含了%@",charString1,subString1);
NSLog(@"位置是:%ld,長度爲:%ld",r.location,r.length);
}else{
NSLog(@"沒有找到");
}
/**
* 替換字符串
*/
NSString *replace = [charString1 stringByReplacingOccurrencesOfString:@"abcd" withString:@"替換"];
NSLog(@"替換後的字符串:%@",replace);
/**
* 可變字符串
*/
//alloc方式創建
NSMutableString *mutablestring1 = [[NSMutableString alloc] initWithFormat:@"helloword"];
//類方法創建
NSMutableString *mutablestring2 = [NSMutableString stringWithString:@"字符串"];
//創建了一個可變字符串對象,字符內容爲空,等着以後追加,插入
NSMutableString *mutablestring3 = [NSMutableString string];
NSMutableString *mutablestring4 = [[NSMutableString alloc] init];
//插入字符串
[mutablestring4 insertString:@"可變字符串" atIndex:0];
NSLog(@"插入後的字符串:%@",mutablestring4);
[mutablestring3 insertString:@"新增的字符串" atIndex:0];
NSLog(@"插入後的字符串:%@",mutablestring3);
//刪除指定位置字符串
NSRange nr =NSMakeRange(0, 3);
[mutablestring2 deleteCharactersInRange:nr];
NSLog(@"刪除後的字符串:%@",mutablestring2);
//追加字符串
[mutablestring1 appendString:@"追加"];
NSLog(@"追加後的字符串:%@",mutablestring1);
//替換字符串,第0個字符開始替換掉1個字符
NSRange range1 = {0,1};
[mutablestring1 replaceCharactersInRange:range1 withString:@"替換"];
NSLog(@"替換後的字符串:%@",mutablestring1);
}
return 0;</span></span>
<span style="background-color: rgb(192, 192, 192);"><span style="font-size:24px;">
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<span style="background-color: rgb(192, 192, 192);"><span style="font-size:24px;">
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<span style="background-color: rgb(192, 192, 192);"><span style="font-size:24px;">輸出效果如下</span></span>
<span style="background-color: rgb(192, 192, 192);"><img src="https://img-blog.csdn.net/20150804222057645?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" width="500" height="700" alt="" />
</span>
<span style="background-color: rgb(192, 192, 192);">
}</span>