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钖庣紑銆佹簮鏂囦欢绫诲瀷锛?/strong>

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@implementation MyClass
- (id)initWithString:(NSString *)aName
{
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+ (MyClass *)myClassWithString:(NSString *)aName
{
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@end

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鏂规硶鍜屾秷鎭?/h3>

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鍦ㄥ疄渚嬫柟娉曚腑锛屽０鏄庣殑寮€澶存槸涓€涓?钬?鍑忓彿锛涜€屽０鏄庣被鏂规硶镞跺墠闱㈣浣跨敤 + 锷犲彿銆备笅鏂囩殑钬灭被鏂规硶钬濈珷鑺傚皢璇︾粏璁茶堪绫绘柟娉旷殑姒傚康銆?/p>

鏂规硶鐨勫悕绉帮纸insertObject:atIndex:锛夋槸涓€绯诲垪鏂规硶绛惧悕鍏抽敭璇嶈仈缁撹€屾垚锛屽寘鎷啋鍙枫€傚啋鍙疯〃绀哄皢浼氩嚭鐜板弬鏁般€傚湪涓婇溃鐨勪緥瀛愪腑锛岃繖涓柟娉曞惈链変袱涓弬鏁般€傚鏋沧煇涓柟娉曟病链夊弬鏁帮纴鍒欓渶瑕佸皢绗竴涓纸涔熸槸鍞竴涓€涓级鏂规硶绛惧悕鍏抽敭璇嶅悗闱㈢殑鍐掑彿鐪佺暐鎺夈€?/p>

褰扑綘闇€瑕佽皟鐢ㄤ竴涓柟娉曟椂锛屽氨鏄钖戝疄鐜颁简璇ユ柟娉旷殑瀵硅薄鍙戦€佷竴涓秷鎭纴绠€钥岃█涔嬶纴灏辨槸缁椤璞″彂阃佹秷鎭€傦纸铏界劧钬滃彂阃佹秷鎭€濆父甯哥敤浣溾€滆皟鐢ㄦ柟娉曗€濈殑杩戜箟璇嶏纴浣嗘槸鍦?Objective-C 鐨勮繍琛屾椂涓纴瀹为檯鎯呭喌鏄彂阃佹秷鎭€傦级涓€涓秷鎭氨鏄竴涓柟娉旷殑钖嶅瓧甯︿笂璇ユ柟娉曟墍闇€鐨勫弬鏁颁俊鎭纸瑕佸拰鏁版嵁绫诲瀷姝ｇ‘瀵瑰簲锛夈€备綘钖戝璞″彂阃佺殑鎵€链夋秷鎭兘鏄姩镐佽皟搴︾殑锛屼互姝ゆ潵瀹炵幇 Objective-C 璇█鐨勫镐佹€с€傦纸澶氭€佹€ф槸鎸囷细涓嶅悓绫诲瀷鐨勫璞￠兘鑳藉钖屼竴绉嶆秷鎭仛鍑哄洖搴斻€傦级链夋椂锛屾墍璋幂敤鐨勬柟娉曟槸鐢辨帴鏀舵秷鎭殑瀵硅薄鐨勭被鐨勭埗绫诲疄鐜扮殑銆?/p>

瑕佽皟搴︿竴涓秷鎭纴杩愯镞惰姹傛纭殑娑堟伅琛ㄨ揪鏂瑰纺銆?strong>娑堟伅琛ㄨ揪寮?/strong>鐢变竴瀵规柟鎷彿锛圼 鍜屄燷锛夋妸娑堟伅锛堜互鍙婃墍闇€鐨勫弬鏁帮级鍖呰９璧锋潵锛屾帴鏀舵秷鎭殑瀵硅薄鍐椤湪宸﹁竟鎷彿钖庤竟銆傛瘆濡傦纴瑕佸悜听myArray 鍙橀噺鎵€钖殑瀵硅薄鍙戦€佷竴涓爄nsertObject:atIndex: 娑堟伅锛屼綘瑕佹寜涓嬮溃鐨勮娉曡繘琛屼功鍐欙细

[myArray insertObject:anObject atIndex:0];

涓轰简阆垮厤澹版槑澶ч噺灞€閮ㄥ彉閲忔潵瀛桦偍涓存椂缁撴灉锛孙bjective-C 鍏佽宓屽娑堟伅琛ㄨ揪寮忋€傛疮涓祵濂楃殑琛ㄨ揪寮忚繑锲炵殑鍊奸兘浼氢綔涓轰竴涓弬鏁帮纴鎴栬€呮帴鏀舵秷鎭殑瀵硅薄锛岀敋镊虫槸鍙︿竴涓秷鎭€傛瘆濡傦纴浣犲彲浠ュ皢涓娄竴涓緥瀛愪腑鐨勪换镒忎竴涓彉閲忔浛鎹㈡垚鐢ㄦ秷鎭帴鏀舵暟鍊笺€傝繖镙蜂竴鏉ワ纴濡傛灉浣犺缮链変竴涓彨锅毬爉yAppObject 鐨勫璞★纴瀹冨惈链夎闂暟缁勫璞′互鍙婂皢瀵硅薄鎻掑叆鏁扮粍鐨勬柟娉曪纴浣犲彲浠ュ皢闾ｄ釜渚嫔瓙鏀归€犳垚涓嬮溃杩欐牱锛?/p>

[[myAppObject theArray] insertObject:[myAppObject objectToInsert] atIndex:0];

Objective-C 杩樻彁渚涗简镣硅娉旷壒镐э纴鐢ㄦ潵璁块梾瀛桦彇鏂规硶銆?strong>瀛桦彇鏂规硶鏄璞＄殑 get 鍜?set 璇彞锛岃繖閲屾槸灏佽鐨勫叧阌纴灏佽鏄墍链夊璞＄殑閲嶈鐗规€с€傚璞℃妸镊繁鐨勭姸镐佸皝瑁咃纸鎴栭殣钘忥级璧锋潵锛屽苟鎻愪緵涓€涓兘璁╂墍链夊疄渚嬭闂繖涓姸镐佺殑阃氱敤鎺ュ彛銆傚埄鐢ㄧ偣璇硶锛屼箣鍓岖殑渚嫔瓙鍙埚彲浠ヨ鏀瑰啓鎴愶细

[myAppObject.theArray insertObject:myAppObject.objectToInsert atIndex:0];

镣硅娉曡缮鍙互鐢ㄦ潵璧嫔€硷细

myAppObject.theArray = aNewArray;

杩欎釜璇硶鍏跺疄鏄燵myAppObject setTheArray:aNewArray]; 杩欎釜璇彞鐨勫彟涓€绉嶈〃杩版柟寮忋€?/p>

钥屼笖锛岃锲炴兂涓€涓嬶纴鍦ㄢ€滀綘鐨勭涓€涓?iOS 搴旂敤钬濇暀绋嬮噷锛屼綘宸茬粡鐢ㄨ绷镣硅娉曟潵瀵瑰彉閲忚繘琛岃祴鍊间简锛?/p>

self.userName = self.textField.text;

涓嬫枃涓殑钬滃凡澹版槑鐨勫睘镐у拰瀛桦彇鏂规硶钬濈珷鑺傚皢钖戜綘璇︾粏浠嬬粛瀛桦彇鏂规硶銆?/p>

绫绘柟娉?/strong>

铏界劧涔嫔墠鐨勮寖渚嬮兘鏄悜绫荤殑瀹炰緥鍙戦€佹秷鎭纴浣嗕綘涔熷彲浠ュ悜绫昏嚜韬彂阃佹秷鎭€傦纸杩欓噷鐨勭被锛屽彲浠ヨ鐞呜В涓虹敱杩愯镞剁敓鎴愮殑听绫?鐨勫璞°€傦级钖戜竴涓被鍙戦€佹秷鎭椂锛岃鏂规硶蹇呴』鍦ㄤ箣鍓嶈澹版槑涓虹被鏂规硶锛岃€屼笉鏄疄渚嬫柟娉曘€傜被鏂规硶鍜?C++ 涓殑闱欐€佹柟娉曞緢鐩镐技銆?/p>

浣犻€氩父浼氩皢绫绘柟娉旷敤浣滃伐铡傛柟娉曪纴鍊熶互鍒涘缓璇ョ被鐨勬柊鐨勫疄渚嬫垨钥呰闂笌璇ョ被鐩稿叧鐨勬煇浜涘叡链変俊鎭€傜被鏂规硶鐨勫０鏄庤娉曞拰瀹炰緥鏂规硶鐨勫崄鍒嗙浉镀忥纴涓嶅悓涔嫔鏄柟娉旷被鍨嬫爣璇嗙鏄竴涓?+ 锷犲彿锛岃€屼笉鏄?钬?鍑忓彿銆?/p>

涓嬮溃鐨勪緥瀛愬睍绀轰简濡备綍鎶娄竴涓被鏂规硶褰扑綔璇ョ被鐨勫伐铡傛柟娉曡繘琛岃皟鐢ㄣ€傚湪链緥涓纴array 鏂规硶鏄灿SArray 绫荤殑涓€涓被鏂规硶锛屽苟涓旇听NSMutableArray 绫荤户鎵裤€傚畠浼氱粰杩欎釜绫荤殑鏂板疄渚嫔垎閰嶅唴瀛桦苟灏呜繖涓疄渚嫔埯濮嫔寲锛屾渶钖庢妸瀹冭繑锲炵粰浣犵殑浠ｇ爜銆?/p>

NSMutableArray *myArray = nil;听 // nil 链川涓婄瓑钖屼簬 NULL

// 鍒涘缓涓€涓柊鏁扮粍锛屽苟灏嗗叾璧嫔€肩粰 myArray 鍙橀噺銆?br> myArray = [NSMutableArray array];

宸插０鏄庣殑灞炴€у拰瀛桦彇鏂规硶

涓€涓睘镐э纴鎸夐€氩父鐨勭悊瑙ｅ氨鏄璞″皝瑁呯殑钟舵€侀噷鐨勪竴椤广€傚畠瑕佷箞鏄竴涓壒镐э纴姣斿钖嶅瓧鎴栬€呴镩诧绂瑕佷箞鏄笌鍙︿竴涓垨澶氢釜鍏朵粬瀵硅薄鐨勫叧鑱斻€傚璞＄殑绫诲畾涔変简涓€涓帴鍙ｏ纴浣跨敤璇ュ璞＄殑鐢ㄦ埛鍙互銮峰彇锛坓et锛夊拰璁剧疆锛垧et锛夊皝瑁呭睘镐т腑鐨勬暟鍊笺€傝€屾墽琛岃繖涓姛鑳界殑鏂规硶灏卞彨锅氩瓨鍙栨柟娉曘€?/p>

瀛桦彇鏂规硶鍏辨湁涓ょ锛屼笖閮借绗﹀悎涓€濂楀懡钖嶈绾︺€傗€淕etter锛埚彇鍊煎櫒锛夆€濆瓨鍙栨柟娉曡兘澶熻繑锲炴煇涓睘镐х殑鍊硷纴瀹幂殑鏂规硶钖嶅拰璇ュ睘镐у悓钖嶃€傗€沦etter锛堣祴鍊煎櫒锛夆€濆瓨鍙栨柟娉曡兘澶熺粰镆愪釜灞炴€ц祴浜堟柊鐨勫€硷纴瀹幂殑锻藉悕瑙勭害鏄爏et灞炴€у悕绉? 杩欐牱鐨勫舰寮忥纴灞炴€у悕绉扮殑棣栧瓧姣嶅ぇ鍐欍€傚湪 Objective-C 妗嗘灦涓纴鍙湁涓ユ牸鎸夌収瑙勭害瀵瑰瓨鍙栨柟娉曡繘琛屽懡钖嶆墠鑳藉疄鐜板绉嶆妧链€?/p>

Objective-C 鎻愪緵浜?strong>宸插０鏄庣殑灞炴€?/strong>锛屽彲浠ヤ綔涓哄０鏄庣殑渚垮埄阃斿缎锛屾湁镞惰缮鑳戒綔涓哄瓨鍙栨柟娉旷殑瀹炵幇銆傚湪钬滀綘鐨勭涓€涓?iOS 搴旂敤钬濇暀绋嬩腑锛屼綘镟剧粡澹版槑浜喡爑serName 灞炴€э细

@property (nonatomic, copy) NSString *userName;

宸插０鏄庣殑灞炴€т娇寰?getter 鍜?setter 鏂规硶镞犻渶鍦ㄧ被閲屾樉寮忓０鏄庛€傜浉鍙嶏纴浣犲湪澹版槑灞炴€ф椂鍙互鍐冲畾鍏跺叿浣撹涓烘柟寮忥纴铹跺悗瑕佹眰缂栬疟鍣ㄥ熀浜庡睘镐у０鏄庯纴鐢熸垚锛堟垨璇村垱寤猴级瀹为檯鍙敤鐨?getter 鍜?setter 鏂规硶銆傚凡澹版槑鐨勫睘镐у噺灏戜简澶ч噺涓嶅繀瑕佺殑浠ｇ爜锛岃妭鐪佸紑鍙戣€呯殑镞堕棿锛屽苟涓旇浣犵殑浠ｇ爜镟村姞娓呯埥銆佸噺灏戝嚭阌欑殑鍙兘銆?/p>

鍦ㄧ被鎺ュ彛鏂囦欢涓纴瑕佸寘钖睘镐у０鏄庡拰鏂规硶澹版槑銆傚熀链殑澹版槑瑕佷娇鐢燖property听缂栬疟鍣ㄦ寚浠わ纴钖庨溃鏄睘镐х殑绫诲瀷鍜屽悕绉般€备綘杩桦彲浠ヤ负灞炴€ц瀹氢笉钖岀殑阃夐」锛屼篃灏辨槸璇村彲浠ヨ皟鏁村瓨鍙栨柟娉旷殑鍏蜂綋琛屼负鏂瑰纺锛屾瘆濡傚睘镐ф槸钖︿负寮卞紩鐢纴鎴栬€呮槸钖︿负鍙灞炴€с€傝繖浜涢€夐」鍐椤湪听@property听鎸囦护钖庤竟鐨勫浑鎷彿涓€?/p>

涓嬭竟鐨勫嚑琛屼唬镰佸睍绀轰简镟村灞炴€у０鏄庣殑渚嫔瓙锛?/p>

@property BOOL flag;听 听 听 听 听 听 听 听 听 听 // 榛樿鏄彧澹版槑绫诲瀷鍜屽悕绉?br> @property (copy) NSString *nameObject;听 // 鍦ㄨ祴鍊艰绷绋嬩腑鎷疯礉瀵硅薄
@property (readonly) UIView *rootView;听 // 鍙０鏄?getter 鏂规硶

鍦ㄧ被鐨勫疄鐜颁唬镰佷腑锛屼綘瑕佷娇鐢燖synthesize听缂栬疟鍣ㄦ寚浠ゆ潵瑕佹眰缂栬疟鍣ㄦ牴鎹０鏄庣殑鎯呭喌锛岀敓鎴愬瓨鍙栨柟娉曪细

@synthesize flag;
@synthesize nameObject;
@synthesize rootView;

浣犱篃鍙互鎶娐燖synthesize听璇彞鏀惧埌涓€琛岄噷闱细

@synthesize flag, nameObject, rootView;

鍦燖synthesize听鎸囦护涓纴浣犺缮鍙互锻戒护缂栬疟鍣ㄦ坊锷犵浉搴旂殑瀹炰緥鍙橀噺鍒扮被瀹氢箟涓幓銆傝澧炲姞涓€涓疄渚嫔彉閲忥纴鍦ㄥ睘镐х殑钖岖О钖庨溃鍐欎竴涓瓑鍙凤纴铹跺悗鍐欎綘鎯宠鐨勫疄渚嫔彉閲忓悕绉帮细

@synthesize nameObject=_nameObject;

鍧楀璞?/h3>

鍧楀璞?/strong>鏄皝瑁呬简涓€绯诲垪锷熻兘鐨勪竴涓璞★纴鎴栬€呮洿阃氢织鍦拌锛屽畠鏄竴涓唬镰佺墖娈碉纴鑳藉鍦ㄤ换浣曟椂鍒昏鎵ц銆傚畠浠湰璐ㄤ笂灏辨槸鍙Щ妞岖殑鍖垮悕鐨勫嚱鏁帮纴鍙互浣滀负鍏朵粬鏂规硶鐨勫弬鏁颁紶鍏ワ纴涔熷彲浠ヤ綔涓哄叾浠栨柟娉曟垨鍑芥暟鐨勮繑锲炲€笺€傚潡瀵硅薄链韩链夊惈绫诲瀷鐨勫弬鏁拌〃锛屽彲鑳藉甫链変笉纭畾鐨勬垨宸插０鏄庣殑杩斿洖鍊肩被鍨嬨€备綘鍙互鎶娄竴涓潡瀵硅薄璧嫔€肩粰镆愪釜鍙橀噺锛岀劧钖庡湪浣犻渶瑕佺殑镞跺€椤儚璋幂敤鍑芥暟涓€镙疯皟鐢ㄥ畠灏辫浜嗐€?/p>

鑴卞瓧绗︼纸^锛夋槸鍧楃殑璇硶镙囱銆傝缮链夋寜镦ф垜浠啛镇夌殑鍙傛暟璇硶瑙勭害鎵€瀹氢箟鐨勮繑锲炲€间互鍙婂潡瀵硅薄鐨勪富浣掳纸涔熷氨鏄彲浠ユ墽琛岀殑浠ｇ爜锛夈€备笅锲炬槸濡备綍鎶婂潡瀵硅薄璧嫔€肩粰涓€涓彉閲忕殑璇硶璁茶В锛?/p>

鎺ヤ笅鏉ワ纴鎸夌収璋幂敤鍑芥暟鐨勬柟寮忚皟鐢ㄥ潡瀵硅薄鍙橀噺灏卞彲浠ヤ简锛?/p>

int result = myBlock(4); // 缁撴灉鏄?28

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Objective-C 妗嗘灦链夎澶氩甫链夊潡瀵硅薄鍙傛暟鐨勬柟娉曘€傛瘆濡傝繖娈碉纴鍦?UIKit 妗嗘灦閲屽０鏄庝简濡备笅绫绘柟娉曪纴瀹冩湁涓や釜鍧楀璞″弬鏁帮细

+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion;

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[UIView animateWithDuration:0.2 animations:^{
听 听 view.alpha = 0.0;

听 听 } completion: ^(BOOL finished) {
听 听 if (finished == YES)
听 听 听 听 [view removeFromSuperview];
}];

鍗忚鍜岃寖鐣寸被

鍗忚鍙互鐢ㄦ潵澹版槑鑳藉鍦ㄤ换浣旷被涓疄鐜扮殑鏂规硶锛岀敋镊抽偅浜涘疄鐜拌鏂规硶鐨勭被缁ф圹镊埆鐨勭被銆傚岗璁柟娉曞畾涔夌殑琛屼负鏄嫭绔嬩簬浠讳綍涓€涓被鐨勚€傚岗璁彲浠ュ畾涔変竴涓姹傚叾浠栫被蹇呴』鎵胯瀹炵幇鐨勬帴鍙ｃ€备篃灏辨槸璇达纴濡傛灉浣犵殑绫诲疄鐜颁简鍗忚涓殑鏂规硶锛岄偅涔堣繖涓被灏辨圹璇鸿瀹屾垚璇ュ岗璁€?/p>

浠庡疄鐢ㄧ殑瑙掑害璇存潵锛屽岗璁畾涔変简涓€绯诲垪鏂规硶锛屽苟寤虹珛璧峰璞′箣闂寸殑钬滃悎绾︹€濄€傝€岃繖浜涘璞′笉蹇呮槸浠讳綍涓€涓‘瀹氱殑绫荤殑瀹炰緥銆傝繖涓悎绾︿娇寰楀璞′箣闂村彲浠ヨ繘琛屼氦娴併€傛煇涓璞℃兂瑕佸憡璇夊彟涓€涓璞★纴椹笂灏呜闱复鐨勪簨浠讹纴鎴栬€呮兂瑕佽闂叧浜庨偅浜涗簨浠剁殑寤鸿銆?/p>

UIApplication听绫诲疄鐜颁简鎵€闇€鐨勫簲鐢ㄨ涓恒€备綘涓嶅繀涓轰简鎺ユ敹绠€鍗旷殑搴旂敤褰揿墠钟舵€佺殑娑堟伅钥屽垱寤轰竴涓燯IApplication听鐨勫瓙绫汇€俇IApplication听绫讳细璋幂敤鎸囧畾鐨勫鎵桦璞′腑鐨勭壒瀹氭柟娉曟潵浼犻€挜偅浜涙秷鎭€傚疄鐜颁简听UIApplicationDelegate听鍗忚鏂规硶鐨勫璞″氨鑳藉鎺ユ敹鍒伴偅浜涙秷鎭简锛屽苟涓旇兘澶熸彁渚涘悎阃傜殑鍙嶉銆?/p>

鍦ㄦ圹璇哄疄鐜般€佹垨閲囩敤镆愪釜鍗忚鐨勬帴鍙ｄ唬镰佷腑锛屽岗璁殑钖岖О瑕佸啓鍦ㄧ埗绫诲悕绉板悗杈圭殑涓€瀵瑰皷鎷彿閲岋纸<钬?gt;锛夈€傚湪钬滀綘鐨勭涓€涓?iOS 搴旂敤钬濇暀绋嬮噷锛屼綘閲囩敤浜喡燯ITextFieldDelegate听鍗忚锛?/p>

@interface HelloWorldViewController : UIViewController <UITextFieldDelegate> {
}
@end

鍦ㄥ疄鐜颁腑锛屼綘镞犻渶澹版槑鍗忚鏂规硶銆?/p>

鍗忚鐨勫０鏄庣湅璧锋潵鍜岀被鎺ュ彛寰堢浉浼硷纴涓嶈绷涓嶅悓鐨勬槸鍗忚娌℃湁鐖剁被锛屽苟涓斾笉钖换浣曞疄渚嫔彉閲忥纸浣嗗畠浠兘澶熷０鏄庡睘镐э级銆备笅闱㈢殑渚嫔瓙灞旷ず濡备綍澹版槑鍙湁涓€涓柟娉旷殑绠€鍗曞岗璁细

@protocol MyProtocol
- (void)myProtocolMethod;
@end

瀵逛簬璁稿濮旀墭鍗忚钥岃█锛岄噰鐢ㄤ竴涓岗璁氨绛変簬鏄疄鐜拌鍗忚涓畾涔夌殑鏂规硶銆傛湁浜涘岗璁姹备綘鏄庣‘澹版槑浣犱细鏀寔璇ュ岗璁纴钥屾湁浜涘岗璁垯鏄棦鍖呭惈蹇呴』瀹炵幇鐨勬柟娉曪纴涔熷寘钖彲阃夋柟娉曘€?/p>

褰扑綘鍦?Objective-C 妗嗘灦涓祻瑙埚ご鏂囦欢镞讹纴浣犲緢蹇氨浼氱湅鍒扮被浼艰繖镙风殑璇彞锛?/p>

@interface NSDate (NSDateCreation)

杩栾璇彞澹版槑浜嗕竴涓寖鐣寸被锛坈ategory锛夛纴鍏惰娉曟槸灏呜寖鐣寸被鐨勫悕绉板寘瑁瑰湪涓€瀵瑰浑鎷彿涓€?strong>锣幂暣绫?/strong>鏄?Objective-C 璇█鐨勪竴涓壒镐э纴璁╀綘鑳藉鎵╁睍镆愪釜绫荤殑鎺ュ彛锛岃€屾棤闇€鍒涘缓瀹幂殑瀛愮被銆傝寖鐣寸被涓殑鏂规硶灏嗘垚涓烘绫荤殑涓€閮ㄥ垎锛埚湪浣犵殑绋嫔簭浣灭敤鍩熻寖锲村唴锛夛纴骞朵细琚绫荤殑鎵€链夊瓙绫荤户鎵裤€备綘鍙互钖戞绫伙纸鎴栧畠鐨勫瓙绫伙级鐨勪换镒忎竴涓疄渚嫔彂阃佹秷鎭潵璋幂敤锣幂暣绫讳腑澹版槑鐨勬柟娉曘€?/p>

浣犲彲浠ュ埄鐢ㄨ寖鐣寸被鍦ㄤ竴涓ご鏂囦欢閲岀粍缁囦簰鐩稿叧鑱旂殑鏂规硶澹版槑銆备綘鐢氲呖鍙互鍦ㄤ笉钖岀殑澶存枃浠朵腑鏀惧叆涓嶅悓鐨勮寖鐣寸被澹版槑銆侰ocoa Touch 妗嗘灦鍜?Cocoa 妗嗘灦鍦ㄥ嚑涔庢墍链夊ご鏂囦欢涓兘鍒╃敤浜呜繖涓妧链纴浠ｇ爜鎵嶅姝ゆ槑鏅般€备綘杩樿兘浣跨敤鍖垮悕锣幂暣绫伙纸涔熷氨鏄湪鍦嗘嫭鍙蜂腑涓嶅啓浠讳綍瀛楃锛夛纴杩欐牱鍙互鎶婂疄渚嫔彉閲忛殣钘忓湪绉佹湁鐨勫疄鐜版枃浠堕噷銆?/p>

棰勫畾涔夌被鍨嫔拰缂栫爜绛栫暐

鍦?Objective-C 璇█涓湁涓€浜涚壒瀹氱殑璇嶆眹锛屼綘瑕侀伩鍏嶅湪澹版槑鍙橀噺镞朵娇鐢ㄨ繖浜涜瘝姹囷纴锲犱负瀹冧滑閮芥湁涓挞桊鐨勭敤阃斻€傚叾涓湁涓€浜涙槸缂栬疟鍣ㄦ寚浠わ纴浠?@ 绗﹀彿寮€澶达纸渚嫔听@interface听鍜屄燖end锛夈€傛湁浜涗缭鐣栾瘝姹囨槸棰勫畾涔夌被鍨嬶纴浠ュ强鍜岃繖浜涚被鍨嬫湁鍏崇殑鏂囧瓧銆侽bjective-C 浣跨敤涓€绯诲垪涓嶅睘浜?ANSI C 鐨勯瀹氢箟绫诲瀷鍜岃瘝姹囥€傚湪镆愪簺鎯呭喌涓嬶纴杩欎簺绫诲瀷鍜岃瘝姹囦细浠ｆ浛瀹冧滑鍦?ANSI C 涓殑瀵瑰簲钥呫€备笅琛ㄥ垪鍑轰简鍑犱釜闱炲父閲嶈鐨勭被鍨嬶纴鍖呮嫭姣忎釜绫诲瀷鎵€鍏佽鐨勮瘝姹囥€?/p>

绫诲瀷銆佹弿杩板拰璇嶆眹锛?/strong>
id 钬?锷ㄦ€佸璞＄被鍨嬨€傚姩镐佺被鍨嫔拰闱欐€佺被鍨嫔璞＄殑钖﹀畾璇嶆眹涓郝爊il銆?br> Class 钬?锷ㄦ€佺被鐨勭被鍨嬨€傚畠鐨勫惁瀹氲瘝姹囦负听Nil銆?br> SEL 钬?阃夋嫨鍣ㄧ殑鏁版嵁绫诲瀷锛坱ypedef锛夛绂杩欑鏁版嵁绫诲瀷浠ｈ〃杩愯镞剁殑涓€绉岖钖嶆柟娉曘€傚畠鐨勫惁瀹氲瘝姹囦负听NULL銆?br> BOOL 钬?甯冨皵鍨嬨€备唬琛ㄥ畠鐨勫€肩殑璇嶆眹涓郝燳ES听鍜屄灿O銆?/p>

浣犻€氩父浼氩湪浠ｇ爜鎺挜敊浠ュ强娴佺▼鎺у埗涓娇鐢ㄨ繖浜涢瀹氢箟鐨勭被鍨嫔拰璇嶆眹銆傚湪绋嫔簭鐨勬祦绋嬫带鍒惰鍙ヤ腑锛屼綘鍙互阃氲绷妫€娴嬬壒瀹氲瘝姹囨潵鍒ゆ柇濡备綍閲囧彇涓嬩竴姝ュ姩浣溿€备緥濡傦细

NSDate *dateOfHire = [employee dateOfHire];
if (dateOfHire != nil) {
听 听 // 澶勭悊姝ょ鎯呭喌
}

鎶娄唬镰佽В閲娄竴涓嬶细濡傛灉瀵硅薄浠ｈ〃鐨勮仒鐢ㄦ棩链熶笉涓郝爊il锛屼篃灏辨槸璇存槸涓€涓悎娉旷殑瀵硅薄锛岄偅涔堥€昏緫灏辨浈涓€涓壒瀹氱殑鏂瑰悜鍙戝睍銆备笅杈规槸杩欐浠ｇ爜鐨勭亩鍖栫増锛屾晥鏋沧槸鐩稿悓鐨勶细

NSDate *dateOfHire = [employee dateOfHire];
if (dateOfHire) {
听 听 // 澶勭悊姝ょ鎯呭喌
}

浣犵敋镊冲彲浠ユ妸浠ｇ爜绠€鍖栨垚杩欎釜镙峰瓙锛埚墠鎻愭槸浣犱笉闇€瑕佸紩鐢燿ateOfHire听瀵硅薄锛夛细

if ([employee dateOfHire]) {
听 听 // 澶勭悊姝ょ鎯呭喌
}

澶勭悊甯冨皵鍊肩殑鏂规硶鏄竴镙风殑銆傚湪杩欎釜渚嫔瓙涓纴isEqual:听鏂规硶浼氲繑锲炰竴涓竷灏斿瀷鐨勫€硷细

BOOL equal = [objectA isEqual:objectB];
if (equal == YES) {
听 听 // 澶勭悊姝ょ鎯呭喌
}

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