[英]How to call method of my ViewController from separate non UIViewController Class
[英]How can I call a category method from my UIViewcontroller class?
錯誤
嗨,我有一個使用base64編碼的類別,我需要從我的主類方法調用thing。 以下是我的類別
碼
#import <Foundation/Foundation.h>
@interface NSString (addition)
- (NSString *) base64StringFromData:(NSData *)data length:(int)length;
@end
在.m文件中
#import "NSString+addition.h"
static char base64EncodingTable[64] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
@implementation NSString (addition)
- (NSString *) base64StringFromData: (NSData *)data length: (int)length {
unsigned long ixtext, lentext;
long ctremaining;
unsigned char input[3], output[4];
short i, charsonline = 0, ctcopy;
const unsigned char *raw;
NSMutableString *result;
lentext = [data length];
if (lentext < 1)
return @"";
result = [NSMutableString stringWithCapacity: lentext];
raw = [data bytes];
ixtext = 0;
while (true) {
ctremaining = lentext - ixtext;
if (ctremaining <= 0)
break;
for (i = 0; i < 3; i++) {
unsigned long ix = ixtext + i;
if (ix < lentext)
input[i] = raw[ix];
else
input[i] = 0;
}
output[0] = (input[0] & 0xFC) >> 2;
output[1] = ((input[0] & 0x03) << 4) | ((input[1] & 0xF0) >> 4);
output[2] = ((input[1] & 0x0F) << 2) | ((input[2] & 0xC0) >> 6);
output[3] = input[2] & 0x3F;
ctcopy = 4;
switch (ctremaining) {
case 1:
ctcopy = 2;
break;
case 2:
ctcopy = 3;
break;
}
for (i = 0; i < ctcopy; i++)
[result appendString: [NSString stringWithFormat: @"%c", base64EncodingTable[output[i]]]];
for (i = ctcopy; i < 4; i++)
[result appendString: @"="];
ixtext += 3;
charsonline += 4;
if ((length > 0) && (charsonline >= length))
charsonline = 0;
}
return result;
}
@end
我的UIViewcontroller方法CODE
我需要從此方法調用ategory方法
- (void)completeTransaction:(SKPaymentTransaction *)transaction {
NSLog(@"completeTransaction...");
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Alert" message:@"Transaction completed." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alert show];
[self provideContentForProductIdentifier:transaction.payment.productIdentifier];
NSLog(@"naveen%@",transaction.transactionReceipt);
//CALL CATEGORY METHOD HERE
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
}
首先將類別導入到您需要的視圖控制器中,如下所示:
#import "NSString+addition.h"
調用它:
NSString *newString = [myString base64StringFromData:data length:length];
只是一個例子。 根據您的情況進行更改...
您的代碼看起來像這樣:
NSString *tsr = [receiptStr base64StringFromData:transaction.transactionReceipt length:[transaction.transactionReceipt length]];
編輯:
您需要在“項目設置”下“構建階段的編譯源”選項卡中的“ NSString + addition.m”中添加類別。
首先,您需要在UIViewController
實現文件中導入類別
#import "NSString+addition.h"
在您的方法中,創建一個新的字符串對象,並像其他所有NSString方法一樣調用該方法:
- (void)completeTransaction:(SKPaymentTransaction *)transaction
{
[...]
NSString *base64String = [stringToConvert base64StringFromData:dataObject length:length];
[...]
}
另請注意,有一些有關類別的編碼約定:
類別名稱以大寫字母開頭。 在您的情況下,您應該將其重命名為Additions
文件名具有以下格式: NameOfClassToAddTheCategoryTo + DescriptiveNameOfNewFunctionality 。 在您的情況下,它可能是“ NSString + Base64”。
編輯:由於發布了新信息,請首先閱讀有關類別的Apple文檔。
然后將base64StringFromData:dataObject:length:
方法更改為類方法( class和instance方法之間有什么區別? ):
+ (NSString *)base64StringFromData:(NSData *)data length:(int)length
{
[...]
return [result copy];
}
終於可以打電話了
- (void)completeTransaction:(SKPaymentTransaction *)transaction
{
[...]
NSData *receiptData = [transaction transactionReceipt];
int receiptDataLength = [transaction transactionReceipt] length];
NSString *base64String = [NSString base64StringFromData:receiptData length:receiptDataLength];
[...]
}
NSString *tsr=[NSString base64StringFromData:transaction.transactionReceipt length:[transaction.transactionReceipt length]];
NSLog(@"%@",tsr);
變更方法:
- (NSString *) base64StringFromData: (NSData *)data length: (int)length;
至:
+ (NSString *) base64StringFromData: (NSData *)data length: (int)length;
因為receiptStr
沒有初始化。
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