转自http://www.raywenderlich.com/4872/objective-c-cheat-sheet-and-quick-reference
Class Header (.h)
#import "AnyHeaderFile.h"
@protocol ClassNameDataSource, ClassNameDelegate;
//声明协议：
@protocal ClassNameDataSource <NSObject>
@optional//选择实现
- (NSUInteger)numberOfItemsInCarousel:(ClassName*)carousel;
@required//必须实现
-(id) copywithzone:(NSZone *) zone; //方法列表
@end
@protocal ClassNameDelegate <NSObject>
@optional//选择实现
- (NSUInteger)numberOfItemsInCarousel:(ClassName*)carousel;
@required//必须实现
-(id) copywithzone:(NSZone *) zone; //方法列表
@end
@interface ClassName : SuperClass {
//declare instance variables
id<ClassNameDelegate> delegate;
id<ClassNameDataSource> dataSource;
}
// define properties
//define methods (including any
//custom initializers)
@end
Class Implementation (.m)
#import "YourClassName.h"
@implementation ClassName
// synthesize properties
// implement methods (including any
//custom initializers, and dealloc)
@end
Defining Methods
- (anytype)doIt;
- (anytype)doItWithA:(anytype)a;
- (anytype)doItWithA:(anytype)a andB:(anytype)b;
Implementing Methods
- (anytype)doItWithA:(anytype)a andB:(anytype)b {
// Do something with a and b...
return retVal;
}
Dealloc
- (void)dealloc {
// Release any retained variables...
[super dealloc];
}
Creating a Class Instance
ClassName * myClass = [[ClassName alloc] init];
// myClass valid until you call:
[myClass release]; // Don’t need w/ ARC
ClassName * myClass = [[[ClassName alloc] init]autorelease];
// myClass valid until next run loop
Calling a Method
[myClass doIt];
[myClass doItWithA:a];
[myClass doItWithA:a andB:b];
Defining Properties
@property (attribute1, attribute2) propertyName;
retain | Call retain on assign
assign | Normal assign(default)
copy | Make copy on assign
nonatomic |Make not threadsafe
readwrite | Create getter&setter(default)
readonly | Create just getter
Synthesizing Properties
@synthesize propertyName;
@synthesize propertyName =_myInstanceVariable;
Using Properties
[myClass setPropertyName:a];
myClass.propertyName = a; // alternative
a = [myClass propertyName];
a = test.propertyName; // alternative
Declaring Variables
anytype myVariable
int | 1,2,500,10000
float | 1.5,3.14,578.234
double |
BOOL | YES,NO,TRUE, FALSE
ClassName * | NSString *,NSArray *,etc
id | Can hold ref to any object
Custom Initializer Example
- (id)initWithParam:(anytype)param {
if ((self = [super init])) {
self.propertyName = param;
}
return self;
}
NSString Quick Examples
NSString *personOne = @"Ray";
NSString *personTwo = @"Shawn";
NSString *combinedString =[NSString stringWithFormat: @"%@: Hello, %@!", personOne, personTwo];
NSLog(@"%@", combinedString);
NSString *tipString = @"24.99";
float tipFloat = [tipString floatValue];
NSArray Quick Examples
NSMutableArray *array = [NSMutableArray arrayWithObjects:personOne, personTwo, nil];
[array addObject:@"Waldo"];
NSLog(@"%d items!", array.count);
for (NSString *person in array) {
NSLog(@"Person: %@", person);
}
NSString *waldo = [array objectAtIndex:2];