1.處理NSLog事件(開發(fā)者模式打印,發(fā)布者模式不打印)
#ifdef DEBUG
#define NSLog(FORMAT, ...) fprintf(stderr,"%s:%d\t%s\n",[[[NSString stringWithUTF8String:FILE] lastPathComponent] UTF8String], LINE, [[NSString stringWithFormat:FORMAT, ##VA_ARGS] UTF8String]);
#else
#define NSLog(FORMAT, ...) nil
#endif
2.在OC語言的情況下導入某些頭文件
#ifdef OBJC
//導入頭文件
#endif
3.處理循環(huán)引用問題(處理當前類對象)
#define WS(weakSelf) __weak __typeof(&*self)weakSelf = self;
4.獲取屏幕寬高
#define ScreenWidth [[UIScreen mainScreen] bounds].size.width
#define ScreenHeight [[UIScreen mainScreen] bounds].size.heigh
5.判斷iOS8或更高系統(tǒng)版本(該方法僅支持iOS10以下版本,謹慎使用,floatValue是不靠譜的,具體原因請看:http://www.reibang.com/p/528897755dc8)
#define IOS8UP ([[UIDevice currentDevice].systemVersion floatValue] >= 8)
6.設置顏色RGB值
#define RGB(a,b,c) [UIColor colorWithRed:(a/255.0) green:(b/255.0) blue:(c/255.0) alpha:1.0]
7.設置顏色RGB值+透明度
#define RGBA(a,b,c,d) [UIColor colorWithRed:(a/255.0) green:(b/255.0) blue:(c/255.0) alpha:d]
8.支持橫屏
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000 // 當前Xcode支持iOS8及以上
#define SCREEN_WIDTH ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)]?[UIScreen mainScreen].nativeBounds.size.width/[UIScreen mainScreen].nativeScale:[UIScreen mainScreen].bounds.size.width)
#define SCREENH_HEIGHT ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)]?[UIScreen mainScreen].nativeBounds.size.height/[UIScreen mainScreen].nativeScale:[UIScreen mainScreen].bounds.size.height)
#define SCREEN_SIZE ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)]?CGSizeMake([UIScreen mainScreen].nativeBounds.size.width/[UIScreen mainScreen].nativeScale,[UIScreen mainScreen].nativeBounds.size.height/[UIScreen mainScreen].nativeScale):[UIScreen mainScreen].bounds.size)
#else
#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define SCREENH_HEIGHT [UIScreen mainScreen].bounds.size.height
#define SCREEN_SIZE [UIScreen mainScreen].bounds.size
#endif
9.設置隨機顏色
#define LRRandomColor [UIColor colorWithRed:arc4random_uniform(256)/255.0 green:arc4random_uniform(256)/255.0 blue:arc4random_uniform(256)/255.0 alpha:1.0]
10.設置view的圓角邊框
#define LRViewBorderRadius(View, Radius, Width, Color)
[View.layer setCornerRadius:(Radius)];
[View.layer setMasksToBounds:YES];
[View.layer setBorderWidth:(Width)];
[View.layer setBorderColor:[Color CGColor]]
11.獲取圖片資源
#define kGetImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]
12.獲取當前語言
#define LRCurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])
13.判斷當前的iPhone設備/系統(tǒng)版本
//判斷是否為iPhone
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
//判斷是否為iPad
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
//判斷是否為ipod
#define IS_IPOD ([[[UIDevice currentDevice] model] isEqualToString:@"iPod touch"])
// 判斷是否為 iPhone 5SE
#define iPhone5SE [[UIScreen mainScreen] bounds].size.width == 320.0f && [[UIScreen mainScreen] bounds].size.height == 568.0f
// 判斷是否為iPhone 6/6s
#define iPhone6_6s [[UIScreen mainScreen] bounds].size.width == 375.0f && [[UIScreen mainScreen] bounds].size.height == 667.0f
// 判斷是否為iPhone 6Plus/6sPlus
#define iPhone6Plus_6sPlus [[UIScreen mainScreen] bounds].size.width == 414.0f && [[UIScreen mainScreen] bounds].size.height == 736.0f
//獲取系統(tǒng)版本
#define IOS_SYSTEM_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]
14.判斷是真機還是模擬器
#if TARGET_OS_IPHONE
//iPhone Device
#endif
#if TARGET_IPHONE_SIMULATOR
//iPhone Simulator
#endif
15.沙盒目錄文件
//獲取temp
#define kPathTemp NSTemporaryDirectory()
//獲取沙盒 Document
#define kPathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]
//獲取沙盒 Cache
#define kPathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]
16.宏與const 的使用
很多小伙伴在定義一個常量字符串脱篙，都會定義成一個宏寞忿，最典型的例子就是服務器的地址薯鼠。在此所有用宏定義常量字符的小伙伴以后就用const來定義吧鲁猩！為什么呢 行剂？我們看看：
宏的用法：一般字符串抽成宏，代碼抽成宏使用遥金。
const用法：一般常用的字符串定義成const（對于常量字符串蘋果推薦我們使用const）可很。
宏與const區(qū)別：
1.編譯時刻不同鳄虱，宏屬于預編譯 弟塞，const屬于編譯時刻
2.宏能定義代碼，const不能拙已，多個宏對于編譯會相對時間較長决记，影響開發(fā)效率，調(diào)試過慢倍踪，const只會編譯一次系宫，縮短編譯時間。
3.宏不會檢查錯誤建车，const會檢查錯誤
通過以上對比扩借，我們以后在開發(fā)中如果定義一個常量字符串就用const，定義代碼就用宏缤至。
static NSString * const loginAccount = @"loginAccount";
static NSString * const loginPassword = @"loginPassword";
17.單例化一個類
//
// SynthesizeSingleton.h
// CES
#ifndef SynthesizeSingleton_h
#define SynthesizeSingleton_h
//聲明
#define DECLARE_SYNTHESIZE_SINGLETON_FOR_CLASS(classname) \
\
+ (classname *)sharedInstance; \
\
//實現(xiàn)
#define IMPLEMENT_SYNTHESIZE_SINGLETON_FOR_CLASS(classname) \
\
static classname *shared##classname = nil; \
\
+ (classname *)sharedInstance \
{ \
@synchronized(self) \
{ \
if (shared##classname == nil) \
{ \
shared##classname = [[self alloc] init]; \
} \
} \
\
return shared##classname; \
} \
\
+ (id)allocWithZone:(NSZone *)zone \
{ \
@synchronized(self) \
{ \
if (shared##classname == nil) \
{ \
shared##classname = [super allocWithZone:zone]; \
return shared##classname; \
} \
} \
\
return nil; \
} \
\
- (id)copyWithZone:(NSZone *)zone \
{ \
return self; \
} \
\
使用方法:在你需要創(chuàng)建單例類的類的.h和.m文件中分別加入以下代碼(首先導入以上代碼所處的頭文件)
DECLARE_SYNTHESIZE_SINGLETON_FOR_CLASS(LoginManager)(.h)聲明
IMPLEMENT_SYNTHESIZE_SINGLETON_FOR_CLASS(LoginManager)(.m)實現(xiàn)
18.字符串是否為空
#define kStringIsEmpty(str) ([str isKindOfClass:[NSNull class]] || str == nil || [str length] < 1 ? YES : NO )
19.數(shù)組是否為空
#define kArrayIsEmpty(array) (array == nil || [array isKindOfClass:[NSNull class]] || array.count == 0)
20.字典是否為空
#define kDictIsEmpty(dic) (dic == nil || [dic isKindOfClass:[NSNull class]] || dic.allKeys == 0)
21.是否是空對象
#define kObjectIsEmpty(_object) (_object == nil
|| [_object isKindOfClass:[NSNull class]]
|| ([_object respondsToSelector:@selector(length)] && [(NSData *)_object length] == 0)
|| ([_object respondsToSelector:@selector(count)] && [(NSArray *)_object count] == 0))
有問題歡迎指正!!本章內(nèi)容也會持續(xù)更新!謝謝!
