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In objectiveC - all the methods are called like below - as a message passing - like below: | |
[receiver selector] | |
This gets converted into C code - at the pre-Compile time: | |
objc_msgSend(receiver, selector, arg1, arg2) | |
e.g. [book1 sellNow] -- to objc_msgSend(book1, sellNow) |
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@interface MyClass : NSObject | |
{ | |
int myInt; | |
NSNumber *myNumber; | |
} | |
- (void) doSomething; | |
+ (void) doSomethingElseWith:(NSNumber*) a; |
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1) UI - UIKit - developed in objectiveC - need for UI | |
Class names starts with "UI" - e.g. UILabel | |
2) Foundation - developed in objectiveC | |
Class names start with "NS" - e.g. NSString | |
3) CoreFoundation - developed in C | |
Class names (actually structures) start with "CF" - e.g. CFString |
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atomic //default | |
nonatomic | |
strong //default for objects | |
weak | |
retain | |
assign //default for premitives | |
unsafe_unretained | |
copy | |
readonly |
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Anonymous code block - which can be assigned to the variable. This code block can be passed as argument to another functions. | |
https://developer.apple.com/library/ios/documentation/cocoa/Conceptual/Blocks/Articles/bxGettingStarted.html#//apple_ref/doc/uid/TP40007502-CH7-SW1 | |
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dispatch_queue_t queue = dispatch_queue_create("com.paypal.dadesai.gcd", DISPATCH_QUEUE_SERIAL); | |
__block int x = 5; | |
dispatch_async(queue, ^{ | |
for(int i=0; i<10; i++) { | |
//x = x+i; | |
NSLog(@"Block 1: %d", x); | |
} | |
}); | |
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One-to-One relation (unlike Notifications - observers) |
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Multiple observers can register for the Notifications.. Similar to Broadcast/Receivers on Android |
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http://rypress.com/tutorials/objective-c/categories.html |
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* Download the ZIP from here: https://code.google.com/p/android-screen-monitor/ | |
* unzip it and extract asm.jar | |
* move it to your favorite location -- say ~ddesai/ | |
* connect the phone using USB | |
* run it "java -jar ~ddesai/asm.jar | |
and you will see the Android screen on your laptop (Mac!) | |
HowTos: | |
* You can select device by CTRL + D (or context menu) |
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