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我試圖讓我構建的計算器應用程序觸發一些簡單的代碼,如果它檢測到我推小數點按鈕(只允許每個值一個小數點)。但是,由於某種原因,這些有關數字的陳述並未被觸發。我已NSLogged它的輸出,它確實顯示爲「。」所以我無法弄清楚爲什麼。我改變了。到任何其他的價值,沒有什麼似乎觸發他們。如果語句讀取發件人UIButton的currentTitle不起作用
NSString *digit = [sender currentTitle];
if (self.userIsInTheMiddleOfEnteringANumber) {
self.display.text = [[[self display] text] stringByAppendingString:digit]; // All in one line!
NSLog(@"Digit is equal to %@",digit);
if (digit == @".") NSLog(@"That was a decimal point!");
} else {
self.display.text = digit;
if (digit == @".") NSLog(@"You can't begin a number with a decimal!");
self.userIsInTheMiddleOfEnteringANumber = YES; // If they aren't typing, now they are!
}
完美,三江源! – Luke 2012-02-13 14:46:48