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NSString屬性何時(shí)用strong何時(shí)用copy?_IOS_腳本之家
@property(nonatomic, strong) NSString *myStrongString; @property(nonatomic, copy) NSString *myCopyString; - (void)stringTest { NSMutableString *mutableStr = [NSMutableString stringWithFormat:@"https://"]; self.m
www.dbjr.com.cn/article/994...htm 2025-5-16
Objective-C中使用NSString類操作字符串的方法小結(jié)_IOS_腳本之家
NSLog(@"string:%@",[string lowercaseString]); //首字母大小寫(xiě) NSLog(@"string:%@",[string capitalizedString]); 打印結(jié)果: 1 2 3 4 5 aString:A STRING string:string string:String 六、在字符串中搜索子串 復(fù)制代碼代碼如下: NSString *string1 = @"This is a string"; NSString *string2 = @...
www.dbjr.com.cn/article/782...htm 2025-5-14
詳解iOS開(kāi)發(fā)中app的歸檔以及偏好設(shè)置的存儲(chǔ)方式_IOS_腳本之家
NSString *path=[docPath stringByAppendingPathComponent:@"person.yangyang"]; NSLog(@"path=%@",path); //3.將自定義的對(duì)象保存到文件中 [NSKeyedArchiver archiveRootObject:p toFile:path]; } - (IBAction)readBtnOnclick:(id)sender { //1.獲取文件路徑 NSString *docPath=[NSSearchPathForDirectorie...
www.dbjr.com.cn/article/768...htm 2025-6-7
Objective-C中字符串NSString的常用操作方法總結(jié)_IOS_腳本之家
NSString *rangeString = [string substringWithRange:NSMakeRange(6, 3)]; 截取的rangeString為s a! 6.判斷字符串是否包含另一個(gè)字符串 (1)rangeOfString判斷 復(fù)制代碼代碼如下: NSString *string1 = @"This is a iOSDevTip"; NSString *string2 = @"iOSDevTip"; NSRange range = [string1 rangeOfString...
www.dbjr.com.cn/article/831...htm 2025-6-6
NSString與C字符串之間的相互轉(zhuǎn)換_C 語(yǔ)言_腳本之家
NSString *nsstring2 = [NSString stringWithUTF8String:cString]; NSLog(@"cString2字符串-->%s ",cString2); NSLog(@"NSString2字符串-->%@",nsstring2); 結(jié)果: char類型的C字符串中文在Mac系統(tǒng)下打印出來(lái)顯示亂碼,這種亂碼并不是錯(cuò)誤,是ASCII解碼所導(dǎo)致的。
www.dbjr.com.cn/article/320...htm 2025-5-28
ios學(xué)習(xí)筆記之基礎(chǔ)數(shù)據(jù)類型的轉(zhuǎn)換_IOS_腳本之家
一、NSString 字符串拼接: 1 NSString *string = [NSString stringWithFormat:@"%@%@",對(duì)象,對(duì)象]; 字符串與int 1 2 intintString = [newString intValue]; NSString *string = [NSString stringWithFormat:@"%d",intSteing]; 字符串與float
www.dbjr.com.cn/article/974...htm 2025-5-26
Objective-C中字符串的拼接方法小結(jié)_IOS_腳本之家
NSString* string1, string2; //已存在的字符串,需要將string1和string2連接起來(lái) 方法1: 復(fù)制代碼代碼如下: string = [NSString initWithFormat:@"%@,%@", string1, string2 ]; 方法2: 復(fù)制代碼代碼如下: string = [string1 stringByAppendingString:string2]; ...
www.dbjr.com.cn/article/799...htm 2025-6-8
IOS中(assign,retain,copy,weak,strong)的區(qū)別以及nonatomic的含義_IOS...
最常見(jiàn)到copy聲明的應(yīng)該是NSString。copy與retain的區(qū)別在于retain的引用是拷貝指針地址,而copy是拷貝對(duì)象本身,也就是說(shuō)retain是淺復(fù)制,copy是深復(fù)制,如果是淺復(fù)制,當(dāng)修改對(duì)象值時(shí),都會(huì)被修改,而深復(fù)制不會(huì)。之所以在NSString這類有可變類型的對(duì)象上使用,是因?yàn)樗鼈冇锌赡芎蛯?duì)應(yīng)的可變類型如NSMutableString之間進(jìn)行賦值操...
www.dbjr.com.cn/article/1078...htm 2025-5-23
iOS獲取Label高度的幾種方法與對(duì)比_IOS_腳本之家
NSLog(@"size = %@", NSStringFromCGSize(testLabel.frame.size)); 輸出:size = {246.33333333333334, 36} 三、sizeWithAttributes 使用NSString的sizeWithAttributes方法。 1 - (CGSize)sizeWithAttributes:(nullable NSDictionary<NSString *, id> *)attrs NS_AVAILABLE(10_0, 7_0); ...
www.dbjr.com.cn/article/985...htm 2025-5-30