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淺析iOS中的淺拷貝和深拷貝(copy和mutableCopy)_IOS_腳本之家

當然在iOS中并不是所有的對象都支持copy,mutableCopy,遵守NSCopying 協(xié)議的類可以發(fā)送copy消息,遵守NSMutableCopying 協(xié)議的類才可以發(fā)送mutableCopy消息。假如發(fā)送了一個沒有遵守上訴兩協(xié)議而發(fā)送 copy或者 mutableCopy,那么就會發(fā)生異常。但是默認的ios類并沒有遵守這兩個協(xié)議。如果想自定義一下copy 那

www.dbjr.com.cn/article/832...htm 2025-5-29

淺談iOS中幾個常用協(xié)議 NSCopying/NSMutableCopying_IOS_腳本之家

NSLog(@"array is %p, copyArray is %p, mutableCopyArray is %p", array, copyArray, mutableCopyArray); array is 0x60800001e580, copyArray is 0x60800001e580, mutableCopyArray is 0x608000046ea0 可變對象copy和mutableCopy均是單層深拷貝,也就是說單層的內(nèi)容拷貝; 1 2 3 4 5 6 7 8 9 10 11 12...

www.dbjr.com.cn/article/1315...htm 2025-5-14

詳解iOS的深淺拷貝_IOS_腳本之家

淺復(fù)制(shallow copy):在淺復(fù)制操作時,對于被復(fù)制對象的每一層都是指針復(fù)制。深復(fù)制(one-level-deep copy):在深復(fù)制操作時,對于被復(fù)制對象,至少有一層是深復(fù)制。完全復(fù)制(real-deep copy):在完全復(fù)制操作時,對于被復(fù)制對象的每一層都是對象復(fù)制。兩圖以避之理解深復(fù)制(mutableCopy) 淺復(fù)制很簡單,就不...

www.dbjr.com.cn/article/896...htm 2025-6-1

IOS URL中文亂碼問題解決方案_IOS_腳本之家

NSMutableString *address = [[NSMutableString stringWithString:SetNiChengStringWithoutUserNameAndNiCheng] mutableCopy]; address = [[address stringByAppendingString:app.name] mutableCopy]; address = [[address stringByAppendingString:@"/"] mutableCopy]; address = [[address stringByAppendingString:_nameTe...

www.dbjr.com.cn/article/960...htm 2025-5-16

iOS開發(fā)之事件傳遞響應(yīng)鏈_IOS_腳本之家

NSMutableString * prefix = @"".mutableCopy; while(next != nil) { NSLog(@"%@%@", prefix, [nextclass]); [prefix appendString: @"--"]; next = [next nextResponder]; } } 控制臺輸出的所有下級事件響應(yīng)者如下: 1 2 3 4 5 6 AView ...

www.dbjr.com.cn/article/780...htm 2025-6-7

IOS Cache設(shè)計詳細介紹及簡單示例_IOS_腳本之家

staticNSMutableDictionary* gPhoneCache = nil; - (NSString*)getFormmatedPhoneNumber:(NSNumber*)phone { if(phone == nil) { returnnil; } NSString* phoneNumberStr = nil; [_phoneLock lock]; if(gPhoneCache == nil) { gPhoneCache = @{}.mutableCopy; ...

www.dbjr.com.cn/article/1020...htm 2025-5-14

詳解iOS開發(fā)之NSURLProtocol的那些坑_IOS_腳本之家

NSMutableURLRequest *request = [self.request mutableCopy]; // 表示該請求已經(jīng)被處理,防止無限循環(huán) [NSURLProtocol setProperty:@(YES) forKey:protocolKey inRequest:request]; curRequest = request; [self startRequest]; } /** * 取消請求 */

www.dbjr.com.cn/article/1281...htm 2025-5-25

Objective-C的緩存框架EGOCache在iOS App開發(fā)中的使用_IOS_腳本之家

_cacheInfo = [[NSDictionary dictionaryWithContentsOfFile:cachePathForKey(_directory, @"EGOCache.plist")] mutableCopy]; if(!_cacheInfo) { _cacheInfo = [[NSMutableDictionary alloc] init]; } 獲取當前時間的NSTimeInterval 復(fù)制代碼代碼如下: ...

www.dbjr.com.cn/article/836...htm 2025-6-3

ios 單利的完整使用實例及銷毀宏定義_IOS_腳本之家

- (className *)mutableCopyWithZone:(NSZone *)zone\ {\ return shared##className;\ }\ + (void)destroyInstance {\ shared##className = nil;\ onceToken = 0;\ }\ 1 2 3 4 5 6 7 8 //用法,注意要遵循NSCopying,NSMutableCopying 協(xié)議 ...

www.dbjr.com.cn/article/1322...htm 2025-5-27

iOS實現(xiàn)屏幕亮度和閃光燈控制的實例代碼_IOS_腳本之家

NSDictionary *exifMetadata = [[metadata objectForKey:(NSString*)kCGImagePropertyExifDictionary] mutableCopy]; floatbrightnessValue = [[exifMetadata objectForKey:(NSString*)kCGImagePropertyExifBrightnessValue] floatValue]; NSLog(@"%f",brightnessValue); ...

www.dbjr.com.cn/article/1151...htm 2025-5-21