Objc语法纪录:NSSet,UIAlert&switch,Fast_Enumeration,NSString,NSArray,Delegate,ternary

AZDelegationDemo.m

//  AZDelegationDemo.h
//  Created by Aladdin Zhang on 8/24/11.

#import
@protocol AZDelegationDemoDelegate;
@interface AZDelegationDemo : NSObject{
idAZDelegationDemoDelegate > delegate;
NSMutableArray * shoppingList;
}
@property (nonatomic,assign) idAZDelegationDemoDelegate > delegate;
@end

@interface AZDelegationDemo (informal_protocol_delegate)
- (void)buyCoffee;
@end

@protocol AZDelegationDemoDelegate NSObject >
@required
- (void)buyPork;
@optional
- (void)buyMilk;
@end

//  AZDelegationDemo.m
//  Created by Aladdin Zhang on 8/24/11.

#import "AZDelegationDemo.h"

@implementation AZDelegationDemo
@synthesize delegate;
- (id)init{
    self = [super init];
    if (self) {
        shoppingList = [NSMutableArray arrayWithCapacity:20];
    }
    return self;
}
- (void)buyStuff{
    NSLog(@"My Shopping List %@",shoppingList);
}
- (void)weeklyShopping{
    if (self.delegate&&[self.delegate conformsToProtocol:@protocol(AZDelegationDemoDelegate)]) {
        [self.delegate performSelector:@selector(buyPork)];
        if ([self.delegate respondsToSelector:@selector(buyMilk)]) {
            [self.delegate performSelector:@selector(buyMilk)];
        }else{
            [shoppingList addObject:[NSString stringWithFormat:@"Milk"]];
        }
        if ([self.delegate respondsToSelector:@selector(buyCoffee)]) {
            [self.delegate performSelector:@selector(buyCoffee)];
        }else{
            [shoppingList addObject:[NSString stringWithFormat:@"Coffee"]];
        }
        [self buyStuff];
    }
}
@end

Fast_Enumeration.m

for (id key in dicQuestion) {
        NSLog(@"Key:%@,Value:%@",key,[dicQuestion objectForKey:key]);
    }

NSArray *array = [NSArray arrayWithObjects:
        @"one", @"two", @"three", @"four", nil];
 
for (NSString *element in array) {
    NSLog(@"element: %@", element);
}
 
NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:
    @"quattuor", @"four", @"quinque", @"five", @"sex", @"six", nil];
 
NSString *key;
for (key in dictionary) {
    NSLog(@"English: %@, Latin: %@", key, [dictionary objectForKey:key]);
}

NSArray *array = [NSArray arrayWithObjects:
        @"one", @"two", @"three", @"four", nil];
 
NSEnumerator *enumerator = [array reverseObjectEnumerator];
for (NSString *element in enumerator) {
    if ([element isEqualToString:@"three"]) {
        break;
    }
}
 
NSString *next = [enumerator nextObject];
// next = "two"

NSArray *array = <#Get an array#>;
NSUInteger index = 0;
 
for (id element in array) {
    NSLog(@"Element at index %u is: %@", index, element);
    index++;
}

//http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocFastEnumeration.html#//apple_ref/doc/uid/TP30001163-CH18-SW1

NSArray.m

//*********
// NSArray
//*********
NSArray *array1 = [NSArray arrayWithObjects:@"One", @"Two", @"Three", nil];
NSArray *array2 = [NSArray arrayWithObjects:@"Two", @"Four", @"One", nil];
NSMutableArray *intermediate = [NSMutableArray arrayWithArray:array1];
[intermediate removeObjectsInArray:array2];
NSUInteger difference = [intermediate count];
With that way, only common elements will be removed.

nsnumber.m

//ref: http://forrst.com/posts/Convert_seconds_to_time_in_Objective_C_iOS-XNd
//used for lx 计算付费问题剩余天数
- (NSString *)convertTimeFromSeconds:(NSString *)seconds {
    
    // Return variable.
    NSString *result = @"";

    // Int variables for calculation.
    int secs = [seconds intValue];
    int tempHour    = 0;
    int tempMinute  = 0;
    int tempSecond  = 0;
 
    NSString *hour      = @"";
    NSString *minute    = @"";
    NSString *second    = @"";

    // Convert the seconds to hours, minutes and seconds.
    tempHour    = secs / 3600;
    tempMinute  = secs / 60 - tempHour * 60;
    tempSecond  = secs - (tempHour * 3600 + tempMinute * 60);
    
    hour    = [[NSNumber numberWithInt:tempHour] stringValue];
    minute  = [[NSNumber numberWithInt:tempMinute] stringValue];
    second  = [[NSNumber numberWithInt:tempSecond] stringValue];
    
    // Make time look like 00:00:00 and not 0:0:0
    if (tempHour < 10) {
        hour = [@"0" stringByAppendingString:hour];
    } 
    
    if (tempMinute < 10) {
        minute = [@"0" stringByAppendingString:minute];
    }
    
    if (tempSecond < 10) {
        second = [@"0" stringByAppendingString:second];
    }
    
    if (tempHour == 0) {
        
        NSLog(@"Result of Time Conversion: %@:%@", minute, second);
        result = [NSString stringWithFormat:@"%@:%@", minute, second];
        
    } else {
       
        NSLog(@"Result of Time Conversion: %@:%@:%@", hour, minute, second); 
        result = [NSString stringWithFormat:@"%@:%@:%@",hour, minute, second];
        
    }
    
    return result;

}

NSSet.m

#http://www.xuanyusong.com/archives/425
#import <UIKit/UIKit.h>
#import "MyClass.h"
int main(int argc, char *argv[])
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    //添加我们的测试代码

    //创建集合
    NSSet *set = [NSSet setWithObjects:@"雨松MOMO",@"15810463139",[NSNumber numberWithInteger: 9527], nil];

    //集合的数量
    int count = [set count];
    NSLog(@"集合中的数量: %d",count);

    //检测包含
    NSString * str = @"雨松MOMO";
    if ([set containsObject:str]) {
        NSLog(@"集合中包含 %@这个对象", str);
    }

    //迭代器遍历
    NSEnumerator *enumerator = [set objectEnumerator];

    NSObject *object  = [enumerator nextObject];

    while (object != nil) {
        NSLog(@"迭代器遍历集合中的数据: %@",object);
        object = [enumerator nextObject];
    }

    //快速枚举遍历
    for (NSObject *object in set) {
        NSLog(@"快速枚举遍历集合中的数据: %@",object);
    }

    //创建集合
    NSMutableSet *set = [NSMutableSet setWithCapacity:10];

    //添加数据
    [set addObject:@"雨松MOMO"];
    [set addObject:[NSNumber numberWithInt:9527]];

    //添加数据在删除
    NSString *str = @"删除我";
    [set addObject:str];
    //删除它
    [set removeObject:str];

    int retVal = UIApplicationMain(argc, argv, nil, nil);
    [pool release];
    return retVal;
}

NSString.m

//**********************************
//Convert NSString to NSDictionary
//**********************************
NSString *responseData = [request responseString];
NSDictionary *responseDic = [responseData objectFromJSONString];

//trim
NSString * string = @"\n \t\t hello string  \t\n  \n\n";
NSString * trimed = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]
NSLog(@"%@", trimed);


NSString *hello=@"Hello,";
NSString *world=@"World!";
NSString *helloWorld;
//将hello和world这两个字符串连接。三种方法：
helloWorld = [NSString initWithFormat:@"%@%@", hello, world ];
helloWorld= [helloWorld stringByAppendingFormat:@"%@%@",hello, world];
helloWorld = [hello stringByAppendingString:world]; //高效

//字符串以开头和结尾比较
NSString *str0 = @"xxd79";
NSString *str1 = @"xxd79";

if([str0 hasPrefix:@"xxd"])
{
    NSLog(@"字符串str0以xxd开头");
}
    
if([str1 hasSuffix:@"79"])
{
    NSLog(@"str1字符串以79结尾");
}

ternary.m

//*****************
//ternary operator
//*****************
NSLog(@"%@", boolVal ? @"YES" : @"NO");
NSString* title = [[DBSession sharedSession] isLinked] ? @"Unlink Dropbox" : @"Link Dropbox";

UIAlert&switch.m

- (void)loadView {
 
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"错误" message:@"请检查您的登录信息" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"Button 1", @"Button 2", @"Button 3", nil];
    
    [alert show];
}

- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    switch (buttonIndex) {
        case 0:
            NSLog(@"Cancel Button Pressed");
            break;
        case 1:
            NSLog(@"Button 退出 Pressed");
        default:
            break;
    }
    
}

UIAlertswitch.m

- (void)loadView {
 
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"错误" message:@"请检查您的登录信息" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"Button 1", @"Button 2", @"Button 3", nil];
    
    [alert show];
}

- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    switch (buttonIndex) {
        case 0:
            NSLog(@"Cancel Button Pressed");
            break;
        case 1:
            NSLog(@"Button 退出 Pressed");
        default:
            break;
    }
    
}