diff options
Diffstat (limited to 'platform/ios/docs/guides/For Style Authors.md')
| -rw-r--r-- | platform/ios/docs/guides/For Style Authors.md | 36 |
1 files changed, 22 insertions, 14 deletions
diff --git a/platform/ios/docs/guides/For Style Authors.md b/platform/ios/docs/guides/For Style Authors.md index 1f2803f3ec..7462112626 100644 --- a/platform/ios/docs/guides/For Style Authors.md +++ b/platform/ios/docs/guides/For Style Authors.md @@ -311,6 +311,11 @@ defined by the style specification. ### Expression operators +Many expression operators defined in the style specification have corresponding +symbols to be used with the `+[NSExpression expressionWithFormat:]`, +`+[NSExpression expressionForFunction:arguments:]`, or +`+[NSExpression expressionForFunction:selectorName:arguments:]` method: + In style specification | Method, function, or predicate type | Format string syntax -----------------------|-------------------------------------|--------------------- `array` | | @@ -320,15 +325,15 @@ In style specification | Method, function, or predicate type | Format string syn `string` | | `to-boolean` | `boolValue` | `to-color` | | -`to-number` | `mgl_numberWithFallbackValues:` | -`to-string` | `stringValue` | +`to-number` | `mgl_numberWithFallbackValues:` | `CAST(zipCode, 'NSNumber')` +`to-string` | `stringValue` | `CAST(ele, 'NSString')` `typeof` | | -`geometry-type` | | -`id` | | -`properties` | | -`at` | | +`geometry-type` | |`$mgl_geometryType` +`id` | |`$mgl_featureIdentifier` +`properties` | |`$mgl_featureProperties` +`at` | `objectFrom:withIndex:` | `array[n]` `get` | `+[NSExpression expressionForKeyPath:]` | Key path -`has` | | +`has` | `mgl_does:have:` | `mgl_does:have:(self, 'key')` `length` | `count:` | `count({1, 2, 2, 3, 4, 7, 9})` `!` | `NSNotPredicateType` | `NOT (p0 OR … OR pn)` `!=` | `NSNotEqualToPredicateOperatorType` | `key != value` @@ -339,14 +344,14 @@ In style specification | Method, function, or predicate type | Format string syn `>=` | `NSGreaterThanOrEqualToPredicateOperatorType` | `key >= value` `all` | `NSAndPredicateType` | `p0 AND … AND pn` `any` | `NSOrPredicateType` | `p0 OR … OR pn` -`case` | `+[NSExpression expressionForConditional:trueExpression:falseExpression:]` | `TERNARY(condition, trueExpression, falseExpression)` -`coalesce` | | -`match` | | -`interpolate` | `mgl_interpolateWithCurveType:parameters:stops:` | -`step` | `mgl_stepWithMinimum:stops:` | -`let` | `mgl_expressionWithContext:` | +`case` | `+[NSExpression expressionForConditional:trueExpression:falseExpression:]` or `MGL_IF` | `TERNARY(1 = 2, YES, NO)` or `MGL_IF(1 = 2, YES, 2 = 2, YES, NO)` +`coalesce` | `mgl_coalesce:` | `mgl_coalesce({x, y, z})` +`match` | `MGL_MATCH` | `MGL_MATCH(x, 0, 'zero match', 1, 'one match', 'two match', 'default')` +`interpolate` | `mgl_interpolate:withCurveType:parameters:stops:` | +`step` | `mgl_step:withMinimum:stops:` | +`let` | `mgl_expressionWithContext:` | `MGL_LET('ios', 11, 'macos', 10.13, $ios + $macos)` `var` | `+[NSExpression expressionForVariable:]` | `$variable` -`concat` | `stringByAppendingString:` | +`concat` | `mgl_join:` | `mgl_join({'Old', ' ', 'MacDonald'})` `downcase` | `lowercase:` | `lowercase('DOWNTOWN')` `upcase` | `uppercase:` | `uppercase('Elysian Fields')` `rgb` | `+[UIColor colorWithRed:green:blue:alpha:]` | @@ -376,6 +381,9 @@ In style specification | Method, function, or predicate type | Format string syn `zoom` | | `$zoom` `heatmap-density` | | `$heatmapDensity` +For operators that have no corresponding `NSExpression` symbol, use the +`MGL_FUNCTION()` format string syntax. + ## Filtering sources You can filter a shape or vector source by setting the |