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Arc of developer part1
1.
ARC of a
Developer Part.1 11 11 22
2.
Automatic Referrence Counting
• Objective-C • - • - retain release • - weak weak referrence 11 11 22
3.
•
• • EXC_BAD_ACCESS •2 release • NSZombie • • 11 11 22
4.
ARC
• GC • • retain/release 2.5 • autoreleasepool 6 • objc_msgSend 33% 11 11 22
5.
ARC
• 11 11 22
6.
ARC
• ARC • LLVM3.0 • -fobjc-arc 11 11 22
7.
•
-fno-objc-arc 11 11 22
8.
• iOS4
weak reference • __unsafe_unretained • weak reference 11 11 22
9.
• __strong
• __weak • __unsafe_unretained • __autoreleasing • 11 11 22
10.
Before ARC
• • autorelease • 11 11 22
11.
•
• VB6 • COM • Objective-C • • JAVA .NET Obj-C GC 11 11 22
12.
• NSObject *obj
= [[NSObject alloc]init]; * obj NSObject 1 11 11 22
13.
• NSObject *obj
= [[NSObject alloc]init]; • NSObject *obj2 = [obj retain]; * obj NSObject 2 * obj2 11 11 22
14.
• NSObject *obj
= [[NSObject alloc]init]; • NSObject *obj2 = [obj retain]; • [obj release]; NSObject 1 * obj2 11 11 22
15.
• NSObject *obj
= [[NSObject alloc]init]; • NSObject *obj2 = [obj retain]; • [obj release]; • [obj2 release]; NSObject 0 11 11 22
16.
Autorelease
• +(id)array{ NSMutableArray *array = [[[NSMutableArray alloc]init]autorelease]; return array; } * array NSArray 1 11 11 22
17.
Autorelease
• +(id)array{ NSMutableArray *array = [[[NSMutableArray alloc]init]autorelease]; return array; } * array NSArray release 1 autorelease pool 11 11 22
18.
Autorelease
• +(id)array{ NSMutableArray *array = [[[NSMutableArray alloc]init]autorelease]; return array; } NSArray release 1 autorelease pool 11 11 22
19.
Autorelease
• +(id)array{ NSMutableArray *array = [[[NSMutableArray alloc]init]autorelease]; return array; } NSArray 0 11 11 22
20.
Retain Release Autorerelease
• • 11 11 22
21.
11
11 22
22.
•
• 11 11 22
23.
Xcode Static Analyzer
• Xcode Analyze • 11 11 22
24.
ARC
• • Retain Release 11 11 22
25.
• __strong
• __weak • __unsafe_unretained • __autoreleasing 11 11 22
26.
nil
• nil • id __strong obj1; • id __strong obj1 = nil; 11 11 22
27.
__strong
• • id • id test = [[NSObject alloc]init]; • id __strong test = [[NSObject alloc]init]; • retain release • strong 11 11 22
28.
__strong
• dealloc release • release • Retain • Release 11 11 22
29.
__strong
+1 +1 { NSMutableArray *array = [[NSMutableArray alloc]init]; [array addObject:[[NSObject alloc]init]]; [array addObject:[[NSObject alloc]init]]; [array addObject:[[NSObject alloc]init]]; [array addObject:[[NSObject alloc]init]]; } • array +1 • array -1 11 11 22
30.
Retain
{ NSMutableArray *array = [[NSMutableArray alloc]init]; [array addObject:[[NSObject alloc]init]]; [array addObject:[[NSObject alloc]init]]; [array addObject:[[NSObject alloc]init]]; [array addObject:[[NSObject alloc]init]]; } @property (nonatomic,retain) NSMutableArray *array; { self.array = [[[NSMutableArray alloc]init]autorelease]; [array addObject:[[[NSObject alloc]init]autorelease]]; [array addObject:[[[NSObject alloc]init]autorelease]]; [array addObject:[[[NSObject alloc]init]autorelease]]; [array addObject:[[[NSObject alloc]init]autorelease]]; } 11 11 22
31.
Autorelease
• Relase +1 +1 { NSMutableArray *array = [[NSMutableArray alloc]init]; [array addObject:[[NSObject alloc]init]]; [array addObject:[[NSObject alloc]init]]; [array addObject:[[NSObject alloc]init]]; [array addObject:[[NSObject alloc]init]]; } 11 11 22
32.
•
autorelease • autorelease pool +(id)array{ id obj = [[NSMutableArray alloc]init]; return obj; } 11 11 22
33.
assign
__unsafe_unretained copy __strong retain __strong strong __strong unsafe_unretained __unsafe_unretained weak __weak 11 11 22
34.
strong
• release retain • 11 11 22
35.
11
11 22
36.
•
A B C E D 11 11 22
37.
A
B C E D 11 11 22
38.
A
B C assign E D 11 11 22
39.
@interface Test :
NSObject{ id childObject; } -(void)setObject:(id)child; @end { id test1 = [[Test alloc]init]; id test2 = [[Test alloc]init]; [test1 setObject:test2]; [test2 setObject:test1]; } 11 11 22
40.
{
id test1 = [[Test alloc]init]; id test2 = [[Test alloc]init]; [test1 setObject:test2]; [test2 setObject:test1]; } test1 test2 test1 test2 11 11 22
41.
__weak
• Retain @interface Test : NSObject{ id __weak childObject; } -(void)setObject:(id)child; @end test1 test2 11 11 22
42.
__weak
• nil • test1 test2 11 11 22
43.
__weak
+1 id __weak obj = [[NSObject alloc]init]; • delegate 11 11 22
44.
autorelease pool
• • Thread NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init]; // [pool drain]; @autoreleasepool { // } • LLVM3.0 ARC 11 11 22
45.
• 11
11 22
46.
11
11 22
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