//協議一般放于.h文件中或者在類的.h文件中@protocol Foo <Xyzzy, NSObject>//<>中的內容表示還需實現自哪些協議，所有協議的根協議一般都是NSObject- (void)someMethod;//默認為必須實現的方法@optional//可選方法聲明- (void)methodWithArgument:(BOOL)argument;@required@property (readonly) int readonlyProperty; //只有getter在協議中@property NSString *readwriteProperty; //getter與setter都在協議中 - (int)methodThatReturnsSomething;@end

#import “Foo.h” @interface MyClass : NSObject <Foo> ???//(do not have to declare Foo’s methods again here, it’s implicit that you implement it)@end//或者私有實現@interface MyClass() <Foo>@end@implementation MyClass//@required methods here! @end

//UI與controller盲通信的方式@property (nonatomic, weak) id <UISomeObjectDelegate> delegate;@property (nonatomic, weak) id <UISomeObjectDataSource> dataSource;

int multiplier = 7;int (^myBlock)(int) = ^(int num) {    return num * multiplier;};//int 為block返回值 //^表示為此為代碼塊//myBlock為此代碼塊名//int 為參數類型//等號右邊為block實現

int multiplier = 7;int (^myBlock)(int) = ^(int num) {    return num * multiplier;}; printf("%d", myBlock(3));// prints "21"

char *myCharacters[3] = { "TomJohn", "George", "Charles Condomine" };//直接使用block作為參數 qsort_b(myCharacters, 3, sizeof(char *), ^(const void *l, const void *r) {    char *left = *(char **)l;    char *right = *(char **)r;    return strncmp(left, right, 1);}); // myCharacters is now { "Charles Condomine", "George", "TomJohn" } 

NSArray *stringsArray = @[ @"string 1",                           @"String 21",                           @"string 12",                           @"String 11",                           @"String 02" ]; static NSStringCompareOptions comparisonOptions = NSCaseInsensitiveSearch | NSNumericSearch |        NSWidthInsensitiveSearch | NSForcedOrderingSearch;NSLocale *currentLocale = [NSLocale currentLocale]; //比較器為代碼塊NSComparator finderSortBlock = ^(id string1, id string2) {    NSRange string1Range = NSMakeRange(0, [string1 length]);    return [string1 compare:string2 options:comparisonOptions range:string1Range locale:currentLocale];}; NSArray *finderSortArray = [stringsArray sortedArrayUsingComparator:finderSortBlock];NSLog(@"finderSortArray: %@", finderSortArray); /*Output:finderSortArray: (    "string 1",    "String 02",    "String 11",    "string 12",    "String 21")*/

//直接使用變量int x = 123; void (^printXAndY)(int) = ^(int y) {    printf("%d %d/n", x, y);}; printXAndY(456); // prints: 123 456//不可以直接更改變量，此處變量對block來說為只讀int x = 123;void (^printXAndY)(int) = ^(int y) {    x = x + y; // error    printf("%d %d/n", x, y);};

__block int x = 123; //  x lives in block storage void (^printXAndY)(int) = ^(int y) {    x = x + y;    printf("%d %d/n", x, y);};printXAndY(456); // prints: 579 456// x is now 579

//注意block的調用時機extern NSInteger CounterGlobal;//block對全局變量有讀寫權限static NSInteger CounterStatic;//靜態變量{    NSInteger localCounter = 42;//普通本地變量    __block char localCharacter;//__block本地變量     void (^aBlock)(void) = ^(void) {        ++CounterGlobal;        ++CounterStatic;        CounterGlobal = localCounter; // localCounter fixed at block creation        localCharacter = 'a'; // sets localCharacter in enclosing scope    };     ++localCounter; // unseen by the block，對block不可見，block的值認為42    localCharacter = 'b';     aBlock(); // execute the block    // localCharacter now 'a'}

dispatch_async(queue, ^{    /*     block中訪問實例變量，instanceVariable為block所在類的實例變量，此時直接訪問了實例變量，因此需要對包含它的對象（self）保留    */    doSomethingWithObject(_instanceVariable);});  id localVariable = _instanceVariable;dispatch_async(queue, ^{    /*    在本地創建了指向實例變量的引用，因此需要保留localVariable而不是self    */    doSomethingWithObject(localVariable);});

typedef float (^MyBlockType)(float, float); MyBlockType myFirstBlock = // ... ;MyBlockType mySecondBlock = // ... ;

//block中引用self，所以有強指針指向self，而block又在self中定義，所以self又有強指針指向block[self.myBlocks addObject:^ {    [self doSomething];}];

__weak MyClass *weakSelf = self; //重新聲明為弱引用[self.myBlocks addObject:^ {    [weakSelf doSomething];}];

+ (void)animateWithDuration:(NSTimeInterval)duration                                  delay:(NSTimeInterval)delay                               options:(UIViewAnimationOptions)options                          animations:(void (^)(void))animations                          completion:(void (^)(BOOL finished))completion;//適用于常規動畫設置//example[UIView animateWithDuration:3.0                      delay:0.0                    options:UIViewAnimationOptionBeginFromCurrentState                 animations:^{ myView.alpha = 0.0; }                 completion:^(BOOL fin) { if (fin) [myView removeFromSuperview]; }];//視圖在3秒內從父視圖淡出，完成動畫后并移除自己+ (void)transitionWithView:(UIView *)view                  duration:(NSTimeInterval)duration                   options:(UIViewAnimationOptions)options                animations:(void (^)(void))animations                completion:(void (^)(BOOL finished))completion;//適用于轉場動畫設置,比如卡牌的翻轉+ (void)transitionFromView:(UIView *)fromView                    toView:(UIView *)toView                  duration:(NSTimeInterval)duration                   options:(UIViewAnimationOptions)options                completion:(void (^)(BOOL finished))completion;//適用于切換視圖動畫

//UIViewAnimationOptions//常規動畫屬性設置（可以同時選擇多個進行設置）UIViewAnimationOptionLayoutSubviews          //父視圖變化時自動更新子視圖約束@see:http://segmentfault.com/q/1010000002872390 UIViewAnimationOptionAllowUserInteraction      //動畫時響應用戶事件，如 touch等   UIViewAnimationOptionBeginFromCurrentState     //從當前狀態開始動畫，比如此時有動畫正在改變屬性UIViewAnimationOptionRepeat                    //無限制重復動畫UIViewAnimationOptionAutoreverse               //執行動畫回路(動畫運行到結束點后仍然以動畫方式回到初始點),前提是設置動畫無限重復UIViewAnimationOptionOverrideInheritedDuration //忽略嵌套動畫時間設置UIViewAnimationOptionOverrideInheritedCurve    //忽略嵌套動畫速度設置UIViewAnimationOptionAllowAnimatedContent      //動畫過程中重繪視圖（注意僅僅適用于轉場動畫）UIViewAnimationOptionShowHideTransitionViews   //視圖切換時直接隱藏舊視圖、顯示新視圖，而不是將舊視圖從父視圖移除（僅僅適用于轉場動畫）UIViewAnimationOptionOverrideInheritedOptions  //不繼承父動畫設置或動畫類型//動畫速度控制（可從其中選擇一個設置）UIViewAnimationOptionCurveEaseInOut           //動畫先緩慢，然后逐漸加速UIViewAnimationOptionCurveEaseIn               //動畫逐漸變慢UIViewAnimationOptionCurveEaSEOut              //動畫逐漸加速UIViewAnimationOptionCurveLinear              //動畫勻速執行，默認值//轉場類型（僅適用于轉場動畫設置，可以從中選擇一個進行設置，基本動畫、關鍵幀動畫不需要設置）UIViewAnimationOptionTransitionNone            //沒有轉場動畫效果UIViewAnimationOptionTransitionFlipFromLeft    //從左側翻轉效果UIViewAnimationOptionTransitionFlipFromRight   //從右側翻轉效果UIViewAnimationOptionTransitionCurlUp          //向后翻頁的動畫過渡效果UIViewAnimationOptionTransitionCurlDown        //向前翻頁的動畫過渡效果UIViewAnimationOptionTransitionCrossDissolve   //舊視圖溶解消失顯示下一個新視圖的效果UIViewAnimationOptionTransitionFlipFromTop     //從上方翻轉效果UIViewAnimationOptionTransitionFlipFromBottom  //從底部翻轉效果

//Create a UIDynamicAnimatorUIDynamicAnimator *animator = [[UIDynamicAnimator alloc] initWithReferenceView:aView];//Create and add UIDynamicBehaviorsUIGravityBehavior *gravity = [[UIGravityBehavior alloc] init]; [animator addBehavior:gravity];UICollisionBehavior *collider = [[UICollisionBehavior alloc] init]; [animator addBehavior:collider];//Add UIDynamicItems to a UIDynamicBehaviorid <UIDynamicItem> item1 = ...; id <UIDynamicItem> item2 = ...; [gravity addItem:item1]; [collider addItem:item1]; [gravity addItem:item2];

//UIDynamicItem 協議@protocol UIDynamicItem@property (readonly) CGRect bounds;@property (readwrite) CGPoint center;@property (readwrite) CGAffineTransform transform; @end//一般UIView即可作為Item，天生實現了UIDynamic協議//以上屬性一般有動畫運行時的animator來改變，若需要主動改變，需要調用- (void)updateItemUsingCurrentState:(id <UIDynamicItem>)item;

//UIGravityBehavior@property CGFloat angle;//重力方向，默認向下@property CGFloat magnitude; // 1.0 is 1000 points/s/s//UICollisionBehavior 碰撞@property UICollisionBehaviorMode collisionMode; // Items,Boundaries,Everything (default) - (void)addBoundaryWithIdentifier:(NSString *)identifier forPath:(UIBezierPath *)path; //用UIBezierPath自定義碰撞邊界@property BOOL translatesReferenceBoundsIntoBoundary;//參考視圖（動力動畫的頂級視圖）作為碰撞邊界//UIAttachmentBehavior 吸附行為- (instancetype)initWithItem:(id <UIDynamicItem>)item attachedToAnchor:(CGPoint)anchor;//以點作為吸附- (instancetype)initWithItem:(id <UIDynamicItem>)i1 attachedToItem:(id <UIDynamicItem>)i2;//以動力項作為吸附,兩個動力項的吸附- (instancetype)initWithItem:(id <UIDynamicItem>)item offsetFromCenter:(CGPoint)offset ... //偏移中心的吸附@property (readwrite) CGFloat length; // 吸附的長度@property (readwrite) CGPoint anchorPoint; // 吸附點@property (readwrite, nonatomic) CGFloat damping; // 錨點移動時的阻尼@property (readwrite, nonatomic) CGFloat frequency; // 錨點移動時的頻率//UISnapBehavior 捕捉行為- (instancetype)initWithItem:(id <UIDynamicItem>)item snapToPoint:(CGPoint)point; @property CGFloat damping;.//移動到錨點時振動的阻尼//UIPushBehavior 推動行為@property UIPushBehaviorMode mode; // Continuous or Instantaneous@property CGVector pushDirection;@property CGFloat magnitude/angle; // magnitude 1.0 moves a 100x100 view at 100 pts/s/s//UIDynamicItemBehavior 動力項行為，應用于所有Items@property (readwrite, nonatomic) CGFloat elasticity; // 彈力，[0.1]@property (readwrite, nonatomic) CGFloat friction; //摩擦力，0表示無摩擦力@property (readwrite, nonatomic) CGFloat density; // 密度，默認為1@property (readwrite, nonatomic) CGFloat resistance; //線性阻力系數0--CGFLOAT_MAX@property (readwrite, nonatomic) CGFloat angularResistance; //角度阻力系數0--CGFLOAT_MAX@property (readwrite, nonatomic) BOOL allowsRotation; //是否允許旋轉- (CGPoint)linearVelocityForItem:(id <UIDynamicItem>)item;//獲取Item速度- (CGFloat)angularVelocityForItem:(id <UIDynamicItem>)item;//獲取Item角速度

- (void)addChildBehavior:(UIDynamicBehavior *)behavior;//將其他行為添加到自定義行為中@property UIDynamicAnimator *dynamicAnimator;//獲取當前行為所在的Animator- (void)willMoveToAnimator:(UIDynamicAnimator *)animator;//行為加入到方法或者移除時（此時參數為nil）會調用@property (copy) void (^action)(void);//每當行為發生時總會執行此block，注意調用比較頻繁的效率問題