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记录有用的代码片段
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| 记录有用的代码片段 |
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| it is a test file. |
自定义系统NSLog输出：
#define NSLog(format, ...) do {\
fprintf(stderr, "<%s : %d> %s\n",\
[[[NSString stringWithUTF8String:__FILE__] lastPathComponent] UTF8String],\
__LINE__, __func__);\
(NSLog)((format), ##__VA_ARGS__);\
fprintf(stderr, "-------\n");\
} while (0)
判断当前对象有没有被释放掉：
Class currentClass = object_getClass(self.delegate);
if (currentClass == _originalClass) {
// 如果delegate没有被释放
}
判断手机硬件型号：
#import <sys/utsname.h>
- (NSString*) deviceName
{
struct utsname systemInfo;
uname(&systemInfo);
NSString* code = [NSString stringWithCString:systemInfo.machine
encoding:NSUTF8StringEncoding];
static NSDictionary* deviceNamesByCode = nil;
if (!deviceNamesByCode) {
deviceNamesByCode = @{@"i386" :@"Simulator",
@"x86_64" :@"Simulator",
@"iPod1,1" :@"iPod Touch", // (Original)
@"iPod2,1" :@"iPod Touch 2G", // (Second Generation)
@"iPod3,1" :@"iPod Touch 3G", // (Third Generation)
@"iPod4,1" :@"iPod Touch 4G", // (Fourth Generation)
@"iPod5,1" :@"iPod Touch 5G",
@"iPhone1,1" :@"iPhone", // (Original)
@"iPhone1,2" :@"iPhone 3G", // (3G)
@"iPhone2,1" :@"iPhone 3GS", // (3GS)
@"iPhone3,1" :@"iPhone 4", //
@"iPhone3,2" :@"iPhone 4",
@"iPhone3,3" :@"iPhone 4",
@"iPhone4,1" :@"iPhone 4S", //
@"iPhone5,1" :@"iPhone 5", // (model A1428, AT&T/Canada)
@"iPhone5,2" :@"iPhone 5", // (model A1429, everything else)
@"iPhone5,3" :@"iPhone 5c", // (model A1456, A1532 | GSM)
@"iPhone5,4" :@"iPhone 5c", // (model A1507, A1516, A1526 (China), A1529 | Global)
@"iPhone6,1" :@"iPhone 5s", // (model A1433, A1533 | GSM)
@"iPhone6,2" :@"iPhone 5s", // (model A1457, A1518, A1528 (China), A1530 | Global)
@"iPhone7,1" :@"iPhone 6 Plus",
@"iPhone7,2" :@"iPhone 6",
@"iPad1,1" :@"iPad", // (1th Generation)
@"iPad2,1" :@"iPad 2",
@"iPad2,2" :@"iPad 2",
@"iPad2,3" :@"iPad 2",
@"iPad2,4" :@"iPad 2",
@"iPad3,1" :@"iPad 3",
@"iPad3,2" :@"iPad 3",
@"iPad3,3" :@"iPad 3",
@"iPad3,4" :@"iPad 4",
@"iPad3,5" :@"iPad 4",
@"iPad3,6" :@"iPad 4",
@"iPad4,1" :@"iPad Air", // 5th Generation iPad (iPad Air) - Wifi
@"iPad4,2" :@"iPad Air", // 5th Generation iPad (iPad Air) - Cellular
@"iPad5,3" :@"iPad Air2", //
@"iPad5,4" :@"iPad Air2", //
@"iPad2,5" :@"iPad mini 1G",
@"iPad2,6" :@"iPad mini 1G",
@"iPad2,7" :@"iPad mini 1G",
@"iPad4,4" :@"iPad mini 2",
@"iPad4,5" :@"iPad mini 2",
@"iPad4,6" :@"iPad mini 2",
@"iPad4,7" :@"iPad mini 3",
@"iPad4,8" :@"iPad mini 3",
@"iPad4,9" :@"iPad mini 3",
@"AppleTV2,1" : @"Apple TV 2G",
@"AppleTV3,1" : @"Apple TV 3G",
@"AppleTV3,2" : @"Apple TV 3G",
};
}
NSString* deviceName = [deviceNamesByCode objectForKey:code];
if (!deviceName) {
// Not found on database. At least guess main device type from string contents:
if ([deviceName rangeOfString:@"iPod"].location != NSNotFound) {
deviceName = @"iPod Touch";
}
else if([deviceName rangeOfString:@"iPad"].location != NSNotFound) {
deviceName = @"iPad";
}
else if([deviceName rangeOfString:@"iPhone"].location != NSNotFound){
deviceName = @"iPhone";
}
else if ([deviceName rangeOfString:@"AppleTV"].location != NSNotFound) {
deviceName = @"AppleTV";
} else if ([deviceName rangeOfString:@"86"].location != NSNotFound) {
deviceName = @"Simulator";
}
}
return deviceName;
}
参考：http://stackoverflow.com/questions/11197509/ios-iphone-get-device-model-and-make
系统版本判断：
#define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)
参考：https://github.com/carlj/CJAMacros/blob/master/CJAMacros/CJAMacros.h
swift查看底层：
swift -dump-ast swiftname
/Applications/Xcode6-Beta2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -dump-ast a.swift
打印当前window的层次：
po [[[UIApplication sharedApplication] keyWindow] recursiveDescription]
- iOS5及以上版本layout放在：
viewWillLayoutSubviews:
或
viewDidLayoutSubviews:
- iOS4系统layout放在：
layoutSubviews
计算文本区域：
+ (CGSize)sizeOfString:(NSString *)string font:(UIFont *)font size:(CGSize)size
{
CGSize stringSize = CGSizeZero;
if (SYSTEM_VERSION_LESS_THAN(@"7.0")) {
stringSize = [string sizeWithFont:font
constrainedToSize:size
lineBreakMode:UILineBreakModeWordWrap];
} else {
stringSize = [string boundingRectWithSize:size
options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
attributes:font.fontDescriptor.fontAttributes
context:nil].size;
}
return stringSize;
}
更改UIToolBar背景色
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")) {
toolBar.translucent = NO;
toolBar.barTintColor = [UIColor whiteColor];
}
四舍五入保留两位小数
float a = 3.456; //保留到小数点后两位
float b =(int)((a * 100) + 0.5) / 100.0;
//output b = 3.46;
不同view继承体系之间区域转换
例如一个视图控制器的view中有一个UITableView，UITableView的某个cell中有个UITextField，想要得到UITextField在view中的位置：
CGRect rect = [self.view convertRect:textField.frame fromView:textField.superview];
//或者
CGRect rect = [textField.superview convertRect:textField.frame toView:self.view];不同view继承体系之间点转换
- 把一个点从一个坐标系转换到接收者的坐标系
- (CGPoint)convertPoint:(CGPoint)point fromView:(UIView *)view参数
point
一个视图中坐标系上的点
view
一个视图包含了点和他自身坐标系。如果是图是nil，那么这个方法将尝试转换基于窗口的坐标系。否则视图和那个接收者必须属于同一个UIWindow对象。
- 转换一个点从接收者坐标系到给定的视图坐标系
- (CGPoint)convertPoint:(CGPoint)point toView:(UIView *)view参数
point
一个在调用者坐标系中的点
view
一个包含了需要被转换的点的视图。如果视图是nil，那么这个方法将会转换成基于窗口的坐标。否则视图和接收者都要属于同一个UIWindow对象。
返回值
Block 使用方式
How Do I Declare A Block in Objective-C?
- As a local variable:
returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};- As a property:
@property (nonatomic, copy) returnType (^blockName)(parameterTypes);- As a method parameter:
- (void)someMethodThatTakesABlock:(returnType (^)(parameterTypes))blockName;- As an argument to a method call:
[someObject someMethodThatTakesABlock:^returnType (parameters) {...}];- As a typedef:
typedef returnType (^TypeName)(parameterTypes);
TypeName blockName = ^returnType(parameters) {...};
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