From d7620e0c5974ea5ad3d5ab337075d024ae8d40b7 Mon Sep 17 00:00:00 2001
From: Qiongpan Ke <keqiongpan@163.com>
Date: Mon, 22 Apr 2019 20:12:30 +0800
Subject: [PATCH] =?UTF-8?q?[BUG]=20=E4=BF=AE=E6=AD=A3=E5=8A=A8=E7=94=BB?=
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---
 ios/sdk/WeexSDK/Sources/Module/WXTransition.mm | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/ios/sdk/WeexSDK/Sources/Module/WXTransition.mm b/ios/sdk/WeexSDK/Sources/Module/WXTransition.mm
index 78c88e66e9..7a7af1ba39 100644
--- a/ios/sdk/WeexSDK/Sources/Module/WXTransition.mm
+++ b/ios/sdk/WeexSDK/Sources/Module/WXTransition.mm
@@ -317,10 +317,15 @@ - (void)_calculatetransitionProcessingStyle
     if (_propertyArray.count == 0) {
         return;
     }
-    double per = 1000 * (_transitionCount + 1 ) / (60 * _transitionDuration);//linear
+
+    // Bugfix: /~https://github.com/apache/incubator-weex/issues/2347
+    NSUInteger frameCount = _transitionDuration * 60 / 1000;
+    NSUInteger currentFrame = _transitionCount + 1;
+    double per = (double)currentFrame / frameCount; //linear
     if (![[NSString stringWithFormat:@"%@",_transitionTimingFunction] isEqualToString: kCAMediaTimingFunctionLinear]) {
-        per = [self solveWithx:((_transitionCount+2)*16)/_transitionDuration epsilon:SOLVE_EPS(_transitionDuration)];
+        per = [self solveWithx:per epsilon:SOLVE_EPS(_transitionDuration)];
     }
+
     NSString *transformString = [NSString string];
     for (WXTransitionInfo *info in _propertyArray) {
         if ([info.propertyName isEqualToString:@"backgroundColor"]) {